Number of Syscalls ID dash yash ash mksh bash-5 bash-4 zsh ysh osh Description 01 40 49 64 59 144 156 194 4572 5715 echo hi 02 90 100 114 117 207 232 250 4635 4620 date 03 90 100 114 131 207 232 250 4635 4620 date ; 04 98 116 123 132 269 292 281 4637 4637 trap 'echo mytrap' EXIT; date 05 98 112 123 132 233 256 278 4635 4635 date; echo hi 06 91 104 115 132 209 256 254 4635 4620 echo hi; date 07 132 149 158 189 268 313 318 4685 4670 date; date 08 132 149 158 189 292 313 319 4683 4668 { date; date; } 09 132 149 158 189 292 313 319 4683 4668 date; { date; } 10 149 171 175 198 310 331 373 4695 4695 . _tmp/sourced.sh 11 40 50 64 73 174 184 203 4572 4572 (echo hi) 12 90 101 114 133 239 262 256 4635 4620 (date) 13 90 102 114 133 247 270 262 4633 4618 ( ( date ) ) 14 98 114 123 134 249 272 290 4641 4641 ( ( date ) ); echo hi 15 91 105 115 134 241 264 260 4635 4620 echo hi; (date) 16 91 105 115 134 241 264 260 4635 4620 echo hi; (date;) 17 41 53 65 74 175 185 207 4585 4571 echo hi; (echo hi;) 18 92 108 116 147 242 285 264 4642 4627 echo hi; (echo hi; date) 19 48 62 73 74 176 186 231 4592 4592 ( echo hi ); echo hi 20 96 105 118 139 234 257 256 4648 4631 date > /tmp/redir.txt 21 93 119 117 141 242 265 259 4648 4631 (date;) > /tmp/sentence.txt 22 163 167 187 231 321 355 363 4714 4695 date 2> /tmp/stderr.txt | wc -l 23 48 57 70 66 154 166 201 4585 4585 echo hi > /tmp/redir.txt 24 43 60 67 81 177 187 205 4595 4581 (echo hi;) > /tmp/sentence.txt 25 115 119 139 174 264 285 312 4667 4648 echo hi 2> /tmp/stderr.txt | wc -l 26 98 113 123 146 262 284 287 4635 4635 (date; echo hi) 27 106 124 131 154 250 292 293 4642 4642 echo $(date) 28 55 73 81 93 185 194 237 4593 4593 echo $(echo hi) 29 106 125 131 154 279 300 299 4642 4642 echo $( ( date ) ) 30 114 138 140 169 282 303 328 4665 4665 echo $( ( date ); echo hi ) 31 48 62 73 74 176 186 231 4592 4592 ( echo hi ); echo done 32 157 162 183 226 318 352 360 4705 4686 date | wc -l 33 157 178 183 226 318 352 360 4570 4705 ! date | wc -l 34 107 112 133 167 261 282 310 4656 4637 echo a | wc -l 35 107 112 133 167 261 282 353 4662 4643 command echo a | wc -l 36 157 170 183 226 318 380 360 4711 4692 command date | wc -l 37 157 186 183 226 318 380 360 4576 4711 ! command date | wc -l 38 157 162 183 226 326 360 367 4705 4686 ( date ) | wc -l 39 140 171 195 200 298 318 319 4675 4675 date | read x 40 108 115 134 168 262 283 289 4663 4644 { echo a; echo b; } | wc -l 41 110 132 135 169 264 285 320 4661 4661 { echo a; echo b; } | wc -l; echo done 42 159 167 185 241 350 383 344 4714 4695 { echo a; date; } | wc -l 43 108 115 134 168 262 283 317 4663 4644 ( echo a; echo b ) | wc -l 44 108 116 134 168 272 293 324 4659 4640 ( echo a; echo b ) | ( wc -l ) 45 109 120 135 183 302 322 303 4660 4641 { echo prefix; ( echo a; echo b ); } | ( wc -l ) 46 54 66 78 82 201 210 233 4585 4585 echo hi & wait 47 104 117 128 142 258 280 283 4636 4636 date & wait 48 117 137 139 178 287 307 325 4659 4659 echo hi | wc -l & wait 49 168 188 189 237 344 377 374 4702 4702 date | wc -l & wait 50 105 125 129 143 296 318 290 4638 4638 trap 'echo mytrap' EXIT; date & wait 51 168 195 190 239 398 431 381 4706 4706 trap 'echo mytrap' EXIT; date | wc -l & wait 52 112 133 136 153 326 346 318 4650 4650 { trap 'echo mytrap' EXIT; date; } & wait TOTAL 5487 6240 6800 8061 13481 14764 15230 241547 242505