Number of Syscalls ID dash ash mksh bash-5 bash-4 zsh ysh osh Description 01 40 64 59 144 156 197 4586 4586 echo hi 02 97 122 131 231 254 277 4652 4652 date 03 42 66 59 145 157 192 4586 4586 date ; 04 98 123 132 269 292 284 4654 4654 trap 'echo mytrap' EXIT; date 05 98 123 132 233 256 281 4654 4654 date; echo hi 06 98 123 132 233 256 281 4654 4654 echo hi; date 07 139 166 189 292 313 345 4705 4705 date; date 08 139 166 189 292 313 346 4705 4705 { date; date; } 09 139 166 189 292 313 346 4705 4705 date; { date; } 10 149 175 198 310 331 376 4717 4717 . _tmp/sourced.sh 11 47 72 73 174 184 230 4603 4603 (echo hi) 12 97 122 133 239 262 283 4652 4652 (date) 13 97 122 133 247 270 289 4652 4652 ( ( date ) ) 14 98 123 134 249 272 293 4654 4654 ( ( date ) ); echo hi 15 98 123 134 241 264 287 4654 4654 echo hi; (date) 16 98 123 134 241 264 287 4654 4654 echo hi; (date;) 17 48 73 74 175 185 234 4604 4604 echo hi; (echo hi;) 18 99 124 147 242 285 291 4655 4655 echo hi; (echo hi; date) 19 48 73 74 176 186 234 4605 4605 ( echo hi ); echo hi 20 105 128 139 234 257 280 4661 4661 date > /tmp/redir.txt 21 100 125 141 242 265 286 4661 4661 (date;) > /tmp/sentence.txt 22 164 187 231 321 355 366 4734 4734 date 2> /tmp/stderr.txt | wc -l 23 48 70 66 154 166 204 4595 4595 echo hi > /tmp/redir.txt 24 50 75 81 177 187 232 4612 4612 (echo hi;) > /tmp/sentence.txt 25 116 139 174 264 285 315 4687 4687 echo hi 2> /tmp/stderr.txt | wc -l 26 105 130 146 262 284 314 4671 4671 (date; echo hi) 27 106 131 154 250 292 296 4659 4659 echo $(date) 28 55 81 93 185 194 240 4610 4610 echo $(echo hi) 29 106 131 154 279 300 302 4659 4659 echo $( ( date ) ) 30 114 140 169 282 303 331 4679 4679 echo $( ( date ); echo hi ) 31 48 73 74 176 186 234 4605 4605 ( echo hi ); echo done 32 158 183 226 318 352 363 4727 4727 date | wc -l 33 158 183 227 318 352 363 4586 4727 ! date | wc -l 34 108 133 167 261 282 313 4678 4678 echo a | wc -l 35 108 133 167 261 282 356 4678 4678 command echo a | wc -l 36 158 183 226 318 380 363 4727 4727 command date | wc -l 37 158 183 226 318 380 363 4586 4727 ! command date | wc -l 38 158 183 226 326 360 369 4727 4727 ( date ) | wc -l 39 141 195 200 298 318 322 4695 4695 date | read x 40 109 134 168 262 283 319 4679 4679 { echo a; echo b; } | wc -l 41 110 135 169 264 285 323 4681 4681 { echo a; echo b; } | wc -l; echo done 42 160 185 241 350 383 377 4729 4729 { echo a; date; } | wc -l 43 109 134 168 262 283 320 4679 4679 ( echo a; echo b ) | wc -l 44 109 134 168 272 293 327 4679 4679 ( echo a; echo b ) | ( wc -l ) 45 110 135 183 302 322 338 4678 4678 { echo prefix; ( echo a; echo b ); } | ( wc -l ) 46 54 78 82 201 210 238 4602 4602 echo hi & wait 47 104 128 142 258 280 288 4651 4651 date & wait 48 117 139 178 287 307 330 4670 4670 echo hi | wc -l & wait 49 168 189 237 344 377 379 4719 4719 date | wc -l & wait 50 105 129 143 296 318 293 4653 4653 trap 'echo mytrap' EXIT; date & wait 51 168 190 238 398 431 384 4719 4719 trap 'echo mytrap' EXIT; date | wc -l & wait 52 112 136 153 326 346 323 4668 4668 { trap 'echo mytrap' EXIT; date; } & wait TOTAL 5568 6881 8003 13491 14711 15804 242395 242677