Number of Syscalls ID dash yash ash mksh bash-5 bash-4 zsh osh ysh Description 01 40 49 64 59 144 156 194 5823 4670 echo hi 02 90 100 114 117 207 232 250 4684 4733 date 03 90 100 114 131 207 232 250 4684 4733 date ; 04 98 116 123 132 269 292 281 4725 4759 trap 'echo mytrap' EXIT; date 05 98 112 123 132 233 256 278 4725 4759 date; echo hi 06 91 104 115 132 209 256 254 4710 4759 echo hi; date 07 132 149 158 189 268 313 318 4734 4783 date; date 08 132 149 158 189 292 313 319 4758 4807 { date; date; } 09 132 149 158 189 292 313 319 4758 4807 date; { date; } 10 149 171 175 198 310 331 373 4785 4819 . _tmp/sourced.sh 11 40 50 64 73 174 184 203 4636 4670 (echo hi) 12 90 101 114 133 239 262 256 4684 4733 (date) 13 90 102 114 133 247 270 262 4708 4757 ( ( date ) ) 14 98 114 123 134 249 272 290 4725 4759 ( ( date ) ); echo hi 15 91 105 115 134 241 264 260 4710 4759 echo hi; (date) 16 91 105 115 134 241 264 260 4710 4759 echo hi; (date;) 17 41 53 65 74 175 185 207 4661 4709 echo hi; (echo hi;) 18 92 108 116 147 242 285 264 4711 4760 echo hi; (echo hi; date) 19 48 62 73 74 176 186 231 4676 4710 ( echo hi ); echo hi 20 96 105 118 139 234 257 256 4715 4766 date > /tmp/redir.txt 21 93 119 117 141 242 265 259 4715 4766 (date;) > /tmp/sentence.txt 22 163 167 187 231 321 355 363 4783 4836 date 2> /tmp/stderr.txt | wc -l 23 48 57 70 66 154 166 201 4669 4703 echo hi > /tmp/redir.txt 24 43 60 67 81 177 187 205 4669 4717 (echo hi;) > /tmp/sentence.txt 25 115 119 139 174 264 285 312 4736 4789 echo hi 2> /tmp/stderr.txt | wc -l 26 98 113 123 146 262 284 287 4725 4759 (date; echo hi) 27 106 124 131 154 250 292 293 4732 4766 echo $(date) 28 55 73 81 93 185 194 237 4683 4717 echo $(echo hi) 29 106 125 131 154 279 300 299 4732 4766 echo $( ( date ) ) 30 114 138 140 169 282 303 328 4749 4783 echo $( ( date ); echo hi ) 31 48 62 73 74 176 186 231 4676 4710 ( echo hi ); echo done 32 157 162 183 227 318 352 360 4776 4829 date | wc -l 33 157 178 183 226 318 352 360 4795 4694 ! date | wc -l 34 107 112 133 167 261 282 310 4727 4780 echo a | wc -l 35 107 112 133 167 261 282 353 4727 4780 command echo a | wc -l 36 157 170 183 226 318 380 360 4776 4829 command date | wc -l 37 157 186 183 227 318 380 360 4795 4694 ! command date | wc -l 38 157 162 183 227 326 360 367 4776 4829 ( date ) | wc -l 39 140 171 195 200 298 318 319 4765 4799 date | read x 40 108 115 134 168 262 283 289 4728 4781 { echo a; echo b; } | wc -l 41 110 132 135 169 264 285 320 4731 4765 { echo a; echo b; } | wc -l; echo done 42 159 167 185 241 350 383 344 4779 4831 { echo a; date; } | wc -l 43 108 115 134 168 262 283 317 4728 4781 ( echo a; echo b ) | wc -l 44 108 116 134 168 272 293 324 4728 4781 ( echo a; echo b ) | ( wc -l ) 45 109 120 135 183 302 322 303 4729 4782 { echo prefix; ( echo a; echo b ); } | ( wc -l ) 46 54 66 78 82 201 210 233 4675 4709 echo hi & wait 47 104 117 128 142 258 280 283 4700 4734 date & wait 48 117 137 139 178 287 307 325 4743 4777 echo hi | wc -l & wait 49 167 188 189 237 344 377 374 4792 4826 date | wc -l & wait 50 105 125 129 143 296 318 290 4708 4742 trap 'echo mytrap' EXIT; date & wait 51 168 196 190 239 398 431 381 4794 4828 trap 'echo mytrap' EXIT; date | wc -l & wait 52 112 133 136 153 326 346 318 4720 4754 { trap 'echo mytrap' EXIT; date; } & wait TOTAL 5486 6241 6800 8064 13481 14764 15230 246883 247648