1 | ## compare_shells: bash-4.4
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2 | ## oils_failures_allowed: 1
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3 |
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4 |
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5 | # Var refs are done with ${!a}
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6 | #
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7 | # local/declare -n is tested in spec/named-ref.test.sh.
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8 | #
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9 | # http://stackoverflow.com/questions/16461656/bash-how-to-pass-array-as-an-argument-to-a-function
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10 |
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11 | #### var ref ${!a}
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12 | a=b
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13 | b=c
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14 | echo ref ${!a} ${a}
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15 | ## stdout: ref c b
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16 |
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17 | #### ${!ref-default}
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18 | ref=x
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19 | echo x=${!ref-default}
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20 |
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21 | x=''
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22 | echo x=${!ref-default}
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23 |
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24 | x=foo
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25 | echo x=${!ref-default}
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26 |
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27 | ## STDOUT:
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28 | x=default
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29 | x=
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30 | x=foo
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31 | ## END
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32 |
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33 | #### ${!undef:-}
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34 | # bash gives empty string, but I feel like this could be an error
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35 | echo undef=${!undef-'default'}
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36 | echo undef=${!undef}
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37 |
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38 | set -u
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39 | echo NOUNSET
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40 | echo undef=${!undef-'default'}
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41 | echo undef=${!undef}
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42 |
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43 | ## status: 1
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44 | ## STDOUT:
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45 | undef=default
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46 | undef=
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47 | NOUNSET
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48 | undef=default
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49 | ## END
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50 |
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51 | #### comparison to ${!array[@]} keys (similar SYNTAX)
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52 |
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53 | declare -a a=(x y)
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54 | argv.py "${!a[@]}"
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55 | echo a_keys=$?
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56 |
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57 | argv.py "${!a}" # missing [] is equivalent to ${!a[0]} ?
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58 | echo a_nobrackets=$?
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59 |
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60 | echo ---
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61 | declare -A A=([A]=a [B]=b)
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62 |
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63 | argv.py ${!A[@]}
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64 | echo A_keys=$?
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65 |
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66 | argv.py "${!A}" # missing [] is equivalent to ${!A[0]} ?
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67 | echo A_nobrackets=$?
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68 |
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69 | ## STDOUT:
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70 | ['0', '1']
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71 | a_keys=0
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72 | ['']
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73 | a_nobrackets=0
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74 | ---
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75 | ['A', 'B']
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76 | A_keys=0
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77 | ['']
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78 | A_nobrackets=0
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79 | ## END
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80 |
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81 | #### ${!a[@]-'default'} is illegal
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82 |
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83 | # bash disallows this when a is an array. We originally made it an error
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84 | # because [@] implies it's an array, but we now changed to follow Bash when the
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85 | # array has a single element.
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86 |
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87 | argv.py "${!a[@]-default}"
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88 | echo status=$?
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89 |
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90 | a=(x y z)
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91 | argv.py "${!a[@]-default}"
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92 | echo status=$?
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93 | ## status: 1
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94 | ## STDOUT:
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95 | ['default']
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96 | status=0
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97 | ## END
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98 | ## BUG bash status: 0
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99 | ## BUG bash STDOUT:
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100 | ['default']
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101 | status=0
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102 | status=1
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103 | ## END
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104 |
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105 |
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106 | #### var ref to $@ with @
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107 | set -- one two
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108 | ref='@'
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109 | echo ref=${!ref}
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110 | ## STDOUT:
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111 | ref=one two
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112 | ## END
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113 |
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114 | #### var ref to $1 and $2 with 1 and 2
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115 | set -- one two
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116 | ref1='1'
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117 | echo ref1=${!ref1}
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118 | ref2='2'
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119 | echo ref2=${!ref2}
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120 |
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121 | ## STDOUT:
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122 | ref1=one
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123 | ref2=two
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124 | ## END
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125 |
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126 | #### var ref: 1, @, *
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127 | set -- x y
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128 | ref=1; argv.py "${!ref}"
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129 | ref=@; argv.py "${!ref}"
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130 | ref=*; argv.py "${!ref}" # maybe_decay_array bug?
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131 |
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132 | ## STDOUT:
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133 | ['x']
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134 | ['x', 'y']
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135 | ['x y']
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136 | ## END
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137 |
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138 | #### var ref to special var BASH_SOURCE
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139 | ref='LINENO'
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140 | echo lineno=${!ref}
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141 | ## STDOUT:
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142 | lineno=2
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143 | ## END
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144 |
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145 | #### var ref to $? with '?'
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146 | myfunc() {
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147 | local ref=$1
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148 | echo ${!ref}
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149 | }
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150 | myfunc FUNCNAME
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151 | myfunc '?'
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152 | ## STDOUT:
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153 | myfunc
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154 | 0
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155 | ## END
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156 |
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157 |
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158 | #### Var ref, then assignment with ${ := }
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159 | z=zz
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160 | zz=
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161 | echo ${!z:=foo}
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162 | echo ${!z:=bar}
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163 | ## STDOUT:
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164 | foo
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165 | foo
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166 | ## END
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167 |
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168 | #### Var ref, then error with ${ ? }
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169 | w=ww
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170 | ww=
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171 | echo ${!w:?'my message'}
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172 | echo done
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173 | ## status: 1
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174 | ## STDOUT:
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175 | ## END
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176 |
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177 | #### Indirect expansion, THEN suffix operators
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178 |
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179 | check_eq() {
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180 | [ "$1" = "$2" ] || { echo "$1 vs $2"; }
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181 | }
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182 | check_expand() {
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183 | val=$(eval "echo \"$1\"")
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184 | [ "$val" = "$2" ] || { echo "$1 -> expected $2, got $val"; }
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185 | }
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186 | check_err() {
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187 | e="$1"
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188 | msg=$(eval "$e" 2>&1) && echo "bad success: $e"
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189 | if test -n "$2"; then
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190 | if [[ "$msg" != $2 ]]; then
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191 | echo "Expected error: $e"
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192 | echo "Got error : $msg"
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193 | fi
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194 | fi
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195 | }
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196 | # Nearly everything in manual section 3.5.3 "Shell Parameter Expansion"
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197 | # is allowed after a !-indirection.
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198 | #
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199 | # Not allowed: any further prefix syntax.
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200 | x=xx; xx=aaabcc
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201 | xd=x
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202 | check_err '${!!xd}'
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203 | check_err '${!!x*}'
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204 | a=(asdf x)
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205 | check_err '${!!a[*]}'
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206 | check_err '${!#x}'
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207 | check_err '${!#a[@]}'
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208 | # And an array reference binds tighter in the syntax, so goes first;
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209 | # there's no way to spell "indirection, then array reference".
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210 | check_expand '${!a[1]}' xx
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211 | b=(aoeu a)
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212 | check_expand '${!b[1]}' asdf # i.e. like !(b[1]), not (!b)[1]
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213 | #
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214 | # Allowed: apparently everything else.
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215 | y=yy; yy=
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216 | check_expand '${!y:-foo}' foo
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217 | check_expand '${!x:-foo}' aaabcc
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218 |
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219 | check_expand '${!x:?oops}' aaabcc
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220 |
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221 | check_expand '${!y:+foo}' ''
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222 | check_expand '${!x:+foo}' foo
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223 |
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224 | check_expand '${!x:2}' abcc
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225 | check_expand '${!x:2:2}' ab
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226 |
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227 | check_expand '${!x#*a}' aabcc
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228 | check_expand '${!x%%c*}' aaab
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229 | check_expand '${!x/a*b/d}' dcc
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230 |
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231 | # ^ operator not fully implemented in OSH
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232 | #check_expand '${!x^a}' Aaabcc
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233 |
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234 | p=pp; pp='\$ '
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235 | check_expand '${!p@P}' '$ '
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236 | echo ok
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237 | ## stdout: ok
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238 |
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239 | #### var ref OF array var -- silent a[0] decay
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240 | declare -a a=(ale bean)
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241 | echo first=${!a}
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242 |
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243 | ale=zzz
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244 | echo first=${!a}
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245 |
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246 | ## status: 0
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247 | ## STDOUT:
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248 | first=
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249 | first=zzz
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250 | ## END
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251 |
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252 | #### array ref
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253 |
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254 | declare -a array=(ale bean)
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255 | ref='array[0]'
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256 | echo ${!ref}
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257 | ## status: 0
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258 | ## STDOUT:
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259 | ale
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260 | ## END
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261 |
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262 | #### array ref with strict_array
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263 | shopt -s strict_array
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264 |
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265 | declare -a array=(ale bean)
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266 | ref='array'
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267 | echo ${!ref}
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268 | ## status: 1
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269 | ## stdout-json: ""
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270 | ## N-I bash status: 0
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271 | ## N-I bash STDOUT:
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272 | ale
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273 | ## END
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274 |
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275 | #### var ref TO array var
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276 | shopt -s compat_array
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277 |
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278 | declare -a array=(ale bean)
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279 |
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280 | ref='array' # when compat_array is on, this is like array[0]
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281 | ref_AT='array[@]'
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282 |
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283 | echo ${!ref}
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284 | echo ${!ref_AT}
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285 |
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286 | ## STDOUT:
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287 | ale
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288 | ale bean
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289 | ## END
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290 |
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291 | #### var ref TO array var, with subscripts
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292 | f() {
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293 | argv.py "${!1}"
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294 | }
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295 | f 'nonexistent[0]'
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296 | array=(x y z)
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297 | f 'array[0]'
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298 | f 'array[1+1]'
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299 | f 'array[@]'
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300 | f 'array[*]'
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301 | # Also associative arrays.
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302 | ## STDOUT:
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303 | ['']
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304 | ['x']
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305 | ['z']
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306 | ['x', 'y', 'z']
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307 | ['x y z']
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308 | ## END
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309 |
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310 | #### var ref TO assoc array a[key]
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311 | shopt -s compat_array
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312 |
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313 | declare -A assoc=([ale]=bean [corn]=dip)
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314 | ref=assoc
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315 | #ref_AT='assoc[@]'
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316 |
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317 | # UNQUOTED doesn't work with Oil's parser
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318 | #ref_SUB='assoc[ale]'
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319 | ref_SUB='assoc["ale"]'
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320 |
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321 | ref_SUB_QUOTED='assoc["al"e]'
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322 |
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323 | ref_SUB_BAD='assoc["bad"]'
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324 |
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325 | echo ref=${!ref} # compat_array: assoc is equivalent to assoc[0]
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326 | #echo ref_AT=${!ref_AT}
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327 | echo ref_SUB=${!ref_SUB}
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328 | echo ref_SUB_QUOTED=${!ref_SUB_QUOTED}
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329 | echo ref_SUB_BAD=${!ref_SUB_BAD}
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330 |
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331 | ## STDOUT:
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332 | ref=
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333 | ref_SUB=bean
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334 | ref_SUB_QUOTED=bean
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335 | ref_SUB_BAD=
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336 | ## END
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337 |
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338 | #### var ref TO array with arbitrary subscripts
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339 | shopt -s eval_unsafe_arith compat_array
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340 |
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341 | f() {
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342 | local val=$(echo "${!1}")
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343 | if test "$val" = y; then
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344 | echo "works: $1"
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345 | fi
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346 | }
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347 | # Warmup: nice plain array reference
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348 | a=(x y)
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349 | f 'a[1]'
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350 | #
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351 | # Not allowed:
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352 | # no brace expansion
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353 | f 'a[{1,0}]' # operand expected
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354 | # no process substitution (but see command substitution below!)
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355 | f 'a[<(echo x)]' # operand expected
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356 | # TODO word splitting seems interesting
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357 | aa="1 0"
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358 | f 'a[$aa]' # 1 0: syntax error in expression (error token is "0")
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359 | # no filename globbing
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360 | f 'a[b*]' # operand expected
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361 | f 'a[1"]' # bad substitution
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362 | #
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363 | # Allowed: most everything else in section 3.5 "Shell Expansions".
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364 | # shell parameter expansion
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365 | b=1
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366 | f 'a[$b]'
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367 | f 'a[${c:-1}]'
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368 | # (... and presumably most of the other features there)
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369 | # command substitution, yikes!
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370 | f 'a[$(echo 1)]'
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371 | # arithmetic expansion
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372 | f 'a[$(( 3 - 2 ))]'
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373 |
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374 | # All of these are undocumented and probably shouldn't exist,
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375 | # though it's always possible some will turn up in the wild and
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376 | # we'll end up implementing them.
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377 |
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378 | ## STDOUT:
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379 | works: a[1]
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380 | works: a[$b]
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381 | works: a[${c:-1}]
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382 | works: a[$(echo 1)]
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383 | works: a[$(( 3 - 2 ))]
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384 | ## END
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385 |
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386 | #### Bizarre tilde expansion in array index
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387 | a=(x y)
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388 | PWD=1
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389 | ref='a[~+]'
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390 | echo ${!ref}
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391 | ## status: 1
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392 | ## BUG bash status: 0
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393 | ## BUG bash STDOUT:
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394 | y
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395 | ## END
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396 |
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397 | #### Indirect expansion TO fancy expansion features bash disallows
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398 |
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399 | check_indir() {
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400 | result="${!1}"
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401 | desugared_result=$(eval 'echo "${'"$1"'}"')
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402 | [ "$2" = "$desugared_result" ] || { echo "$1 $desugared_result"; }
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403 | }
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404 | x=y
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405 | y=a
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406 | a=(x y)
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407 | declare -A aa
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408 | aa=([k]=r [l]=s)
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409 | # malformed array indexing
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410 | check_indir "a[0"
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411 | check_indir "aa[k"
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412 | # double indirection
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413 | check_indir "!x" a
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414 | check_indir "!a[0]" y
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415 | # apparently everything else in the manual under "Shell Parameter Expansion"
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416 | check_indir "x:-foo" y
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417 | check_indir "x:=foo" y
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418 | check_indir "x:?oops" y
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419 | check_indir "x:+yy" yy
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420 | check_indir "x:0" y
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421 | check_indir "x:0:1" y
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422 | check_indir "!a@" "a aa"
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423 | # (!a[@] is elsewhere)
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424 | check_indir "#x" 1
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425 | check_indir "x#y"
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426 | check_indir "x/y/foo" foo
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427 | check_indir "x@Q" "'y'"
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428 | echo done
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429 | ## status: 1
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430 | ## stdout-json: ""
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431 | ## OK bash status: 0
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432 | ## OK bash stdout: done
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433 |
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434 | #### Bad var ref
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435 | a='bad var name'
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436 | echo ref ${!a}
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437 | echo status=$?
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438 |
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439 | ## STDOUT:
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440 | status=1
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441 | ## END
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442 | ## OK osh stdout-json: ""
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443 | ## OK osh status: 1
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444 |
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445 | #### Bad var ref 2
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446 | b='/' # really bad
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447 | echo ref ${!b}
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448 | echo status=$?
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449 | ## STDOUT:
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450 | status=1
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451 | ## END
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452 | ## OK osh stdout-json: ""
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453 | ## OK osh status: 1
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454 |
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455 | #### ${!OPTIND} (used by bash completion
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456 | set -- a b c
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457 | echo ${!OPTIND}
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458 | f() {
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459 | local OPTIND=1
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460 | echo ${!OPTIND}
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461 | local OPTIND=2
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462 | echo ${!OPTIND}
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463 | }
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464 | f x y z
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465 | ## STDOUT:
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466 | a
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467 | x
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468 | y
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469 | ## END
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470 |
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471 | #### var ref doesn't need cycle detection
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472 | x=y
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473 | y=x
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474 | echo cycle=${!x}
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475 |
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476 | typeset -n a=b
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477 | typeset -n b=a
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478 | echo cycle=${a}
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479 | ## status: 1
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480 | ## STDOUT:
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481 | cycle=x
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482 | ## END
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483 | ## OK bash status: 0
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484 | ## OK bash STDOUT:
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485 | cycle=x
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486 | cycle=
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487 | ## END
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488 |
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489 | #### Var Ref Code Injection $(tee PWNED)
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490 |
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491 | typeset -a a
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492 | a=(42)
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493 |
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494 | x='a[$(echo 0 | tee PWNED)]'
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495 |
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496 | echo ${!x}
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497 |
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498 | if test -f PWNED; then
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499 | echo PWNED
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500 | cat PWNED
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501 | else
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502 | echo NOPE
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503 | fi
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504 |
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505 | ## status: 1
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506 | ## STDOUT:
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507 | ## END
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508 |
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509 | ## BUG bash status: 0
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510 | ## BUG bash STDOUT:
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511 | 42
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512 | PWNED
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513 | 0
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514 | ## END
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515 |
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516 | #### ${!array_ref:-set} and ${!array_ref:=assign}
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517 |
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518 | ref='a[@]'
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519 | a=('' '' '')
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520 |
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521 | echo "==== check ===="
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522 |
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523 | argv.py "${!ref:-set}"
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524 | argv.py "${a[@]:-set}"
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525 |
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526 | echo "==== assign ===="
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527 |
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528 | argv.py "${!ref:=assign}"
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529 | argv.py "${!ref}"
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530 | a=('' '' '') # revert the state in case it is modified
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531 |
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532 | argv.py "${a[@]:=assign}"
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533 | argv.py "${a[@]}"
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534 |
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535 | ## STDOUT:
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536 | ==== check ====
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537 | ['', '', '']
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538 | ['', '', '']
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539 | ==== assign ====
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540 | ['', '', '']
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541 | ['', '', '']
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542 | ['', '', '']
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543 | ['', '', '']
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544 | ## END
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545 |
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546 | #### Array indirect expansion with suffix operators
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547 |
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548 | declare -A ref=(['dummy']=v1)
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549 | function test-suffixes {
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550 | echo "==== $1 ===="
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551 | ref['dummy']=$1
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552 | argv.py "${!ref[@]:2}"
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553 | argv.py "${!ref[@]:1:2}"
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554 | argv.py "${!ref[@]:-empty}"
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555 | argv.py "${!ref[@]:+set}"
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556 | argv.py "${!ref[@]:=assign}"
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557 | }
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558 |
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559 | v1=value
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560 | test-suffixes v1
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561 | echo "v1=$v1"
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562 |
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563 | v2=
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564 | test-suffixes v2
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565 | echo "v2=$v2"
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566 |
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567 | a1=()
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568 | test-suffixes a1
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569 | argv.py "${a1[@]}"
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570 |
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571 | a2=(element)
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572 | test-suffixes 'a2[0]'
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573 | argv.py "${a2[@]}"
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574 |
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575 | a3=(1 2 3)
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576 | test-suffixes 'a3[@]'
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577 | argv.py "${a3[@]}"
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578 |
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579 | ## STDOUT:
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580 | ==== v1 ====
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581 | ['lue']
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582 | ['al']
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583 | ['value']
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584 | ['set']
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585 | ['value']
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586 | v1=value
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587 | ==== v2 ====
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588 | ['']
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589 | ['']
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590 | ['empty']
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591 | ['']
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592 | ['assign']
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593 | v2=assign
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594 | ==== a1 ====
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595 | ['']
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596 | ['']
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597 | ['empty']
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598 | ['']
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599 | ['assign']
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600 | ['assign']
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601 | ==== a2[0] ====
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602 | ['ement']
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603 | ['le']
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604 | ['element']
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605 | ['set']
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606 | ['element']
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607 | ['element']
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608 | ==== a3[@] ====
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609 | ['3']
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610 | ['2', '3']
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611 | ['1', '2', '3']
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612 | ['set']
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613 | ['1', '2', '3']
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614 | ['1', '2', '3']
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615 | ## END
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616 |
|
617 | #### Array indirect expansion with replacements
|
618 |
|
619 | declare -A ref=(['dummy']=v1)
|
620 | function test-rep {
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621 | echo "==== $1 ===="
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622 | ref['dummy']=$1
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623 | argv.py "${!ref[@]#?}"
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624 | argv.py "${!ref[@]%?}"
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625 | argv.py "${!ref[@]//[a-f]}"
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626 | argv.py "${!ref[@]//[a-f]/x}"
|
627 | }
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628 |
|
629 | v1=value
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630 | test-rep v1
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631 |
|
632 | v2=
|
633 | test-rep v2
|
634 |
|
635 | a1=()
|
636 | test-rep a1
|
637 |
|
638 | a2=(element)
|
639 | test-rep 'a2[0]'
|
640 |
|
641 | a3=(1 2 3)
|
642 | test-rep 'a3[@]'
|
643 |
|
644 | ## STDOUT:
|
645 | ==== v1 ====
|
646 | ['alue']
|
647 | ['valu']
|
648 | ['vlu']
|
649 | ['vxlux']
|
650 | ==== v2 ====
|
651 | ['']
|
652 | ['']
|
653 | ['']
|
654 | ['']
|
655 | ==== a1 ====
|
656 | ['']
|
657 | ['']
|
658 | ['']
|
659 | ['']
|
660 | ==== a2[0] ====
|
661 | ['lement']
|
662 | ['elemen']
|
663 | ['lmnt']
|
664 | ['xlxmxnt']
|
665 | ==== a3[@] ====
|
666 | ['', '', '']
|
667 | ['', '', '']
|
668 | ['1', '2', '3']
|
669 | ['1', '2', '3']
|
670 | ## END
|
671 |
|
672 | ## BUG bash STDOUT:
|
673 | ==== v1 ====
|
674 | ['alue']
|
675 | ['valu']
|
676 | ['vlu']
|
677 | ['vxlux']
|
678 | ==== v2 ====
|
679 | ['']
|
680 | ['']
|
681 | ['']
|
682 | ['']
|
683 | ==== a1 ====
|
684 | ['']
|
685 | ['']
|
686 | ['']
|
687 | ['']
|
688 | ==== a2[0] ====
|
689 | ['lement']
|
690 | ['elemen']
|
691 | ['lmnt']
|
692 | ['xlxmxnt']
|
693 | ==== a3[@] ====
|
694 | []
|
695 | []
|
696 | ['1', '2', '3']
|
697 | ['1', '2', '3']
|
698 | ## END
|
699 |
|
700 | #### Array indirect expansion with @? conversion
|
701 |
|
702 | declare -A ref=(['dummy']=v1)
|
703 | function test-op0 {
|
704 | echo "==== $1 ===="
|
705 | ref['dummy']=$1
|
706 | argv.py "${!ref[@]@Q}"
|
707 | argv.py "${!ref[@]@P}"
|
708 | argv.py "${!ref[@]@a}"
|
709 | }
|
710 |
|
711 | v1=value
|
712 | test-op0 v1
|
713 |
|
714 | v2=
|
715 | test-op0 v2
|
716 |
|
717 | a1=()
|
718 | test-op0 a1
|
719 |
|
720 | a2=(element)
|
721 | test-op0 'a2[0]'
|
722 |
|
723 | a3=(1 2 3)
|
724 | test-op0 'a3[@]'
|
725 |
|
726 | ## STDOUT:
|
727 | ==== v1 ====
|
728 | ['value']
|
729 | ['value']
|
730 | ['']
|
731 | ==== v2 ====
|
732 | ['assign']
|
733 | ['assign']
|
734 | ['']
|
735 | ==== a1 ====
|
736 | ['assign']
|
737 | ['assign']
|
738 | ['a']
|
739 | ==== a2[0] ====
|
740 | ['element']
|
741 | ['element']
|
742 | ['a']
|
743 | ==== a3[@] ====
|
744 | ['1', '2', '3']
|
745 | ['1', '2', '3']
|
746 | ['a', 'a', 'a']
|
747 | ## END
|
748 |
|
749 | ## OK bash STDOUT:
|
750 | ==== v1 ====
|
751 | ["'value'"]
|
752 | ['value']
|
753 | ['']
|
754 | ==== v2 ====
|
755 | ["'assign'"]
|
756 | ['assign']
|
757 | ['']
|
758 | ==== a1 ====
|
759 | ["'assign'"]
|
760 | ['assign']
|
761 | ['a']
|
762 | ==== a2[0] ====
|
763 | ["'element'"]
|
764 | ['element']
|
765 | ['a']
|
766 | ==== a3[@] ====
|
767 | ["'1'", "'2'", "'3'"]
|
768 | ['1', '2', '3']
|
769 | ['a', 'a', 'a']
|
770 | ## END
|