Number of Syscalls ID dash ash mksh bash-5 bash-4 zsh ysh osh Description 01 40 64 59 144 156 197 4825 4824 echo hi 02 97 122 131 231 254 277 4889 4888 date 03 42 66 59 145 157 192 4825 4824 date ; 04 98 123 132 269 292 284 4919 4890 trap 'echo mytrap' EXIT; date 05 98 123 132 233 256 281 4891 4890 date; echo hi 06 98 123 132 233 256 281 4891 4890 echo hi; date 07 139 166 189 292 313 345 4939 4938 date; date 08 139 166 189 292 313 346 4940 4938 { date; date; } 09 139 166 189 292 313 346 4940 4939 date; { date; } 10 149 175 198 310 331 376 4953 4950 . _tmp/sourced.sh 11 47 72 73 174 184 230 4840 4839 (echo hi) 12 97 122 133 239 262 283 4888 4887 (date) 13 97 122 133 247 270 289 4891 4889 ( ( date ) ) 14 98 123 134 249 272 293 4901 4896 ( ( date ) ); echo hi 15 98 123 134 241 264 287 4891 4890 echo hi; (date) 16 98 123 134 241 264 287 4891 4890 echo hi; (date;) 17 48 73 74 175 185 234 4841 4840 echo hi; (echo hi;) 18 99 124 147 242 285 291 4892 4891 echo hi; (echo hi; date) 19 48 73 74 176 186 234 4843 4842 ( echo hi ); echo hi 20 105 128 139 234 257 280 4900 4897 date > /tmp/redir.txt 21 100 125 141 242 265 286 4898 4897 (date;) > /tmp/sentence.txt 22 164 187 231 321 355 366 4969 4968 date 2> /tmp/stderr.txt | wc -l 23 48 70 66 154 166 204 4835 4838 echo hi > /tmp/redir.txt 24 50 75 81 177 187 232 4849 4848 (echo hi;) > /tmp/sentence.txt 25 116 139 174 264 285 315 4922 4921 echo hi 2> /tmp/stderr.txt | wc -l 26 105 130 146 262 284 314 4906 4904 (date; echo hi) 27 106 131 154 250 292 296 4901 4913 echo $(date) 28 55 81 93 185 194 240 4852 4855 echo $(echo hi) 29 106 131 154 279 300 302 4899 4910 echo $( ( date ) ) 30 114 140 169 282 303 331 4916 4916 echo $( ( date ); echo hi ) 31 48 73 74 176 186 234 4843 4842 ( echo hi ); echo done 32 158 183 227 318 352 363 4961 4961 date | wc -l 33 158 183 226 318 352 363 4825 4963 ! date | wc -l 34 108 133 167 261 282 313 4913 4912 echo a | wc -l 35 108 133 167 261 282 356 4917 4914 command echo a | wc -l 36 158 183 226 318 380 363 4966 4961 command date | wc -l 37 158 183 226 318 380 363 4825 4961 ! command date | wc -l 38 158 183 227 326 360 370 4962 4961 ( date ) | wc -l 39 141 195 200 298 318 322 4931 4931 date | read x 40 109 134 168 262 283 319 4914 4913 { echo a; echo b; } | wc -l 41 110 135 169 264 285 323 4916 4915 { echo a; echo b; } | wc -l; echo done 42 160 185 241 350 383 377 4965 4964 { echo a; date; } | wc -l 43 109 134 168 262 283 320 4914 4913 ( echo a; echo b ) | wc -l 44 109 134 168 272 293 327 4914 4913 ( echo a; echo b ) | ( wc -l ) 45 110 135 183 302 322 338 4915 4914 { echo prefix; ( echo a; echo b ); } | ( wc -l ) 46 54 78 82 201 210 238 4842 4841 echo hi & wait 47 104 128 142 258 280 288 4894 4893 date & wait 48 117 139 178 287 307 330 4911 4909 echo hi | wc -l & wait 49 167 189 237 344 377 379 4969 4959 date | wc -l & wait 50 105 129 143 296 318 293 4896 4891 trap 'echo mytrap' EXIT; date & wait 51 168 190 239 398 431 384 4960 4963 trap 'echo mytrap' EXIT; date | wc -l & wait 52 112 136 153 326 346 323 4907 4904 { trap 'echo mytrap' EXIT; date; } & wait TOTAL 5567 6881 8005 13491 14711 15805 254797 255000