Number of Syscalls ID dash ash mksh bash-5 bash-4 zsh ysh osh Description 01 40 64 59 144 156 197 4604 4604 echo hi 02 97 122 131 231 254 277 4667 4667 date 03 42 66 59 145 157 192 4604 4604 date ; 04 98 123 132 269 292 284 4669 4669 trap 'echo mytrap' EXIT; date 05 98 123 132 233 256 281 4669 4669 date; echo hi 06 98 123 132 233 256 281 4669 4669 echo hi; date 07 139 166 189 292 313 345 4717 4717 date; date 08 139 166 189 292 313 346 4717 4717 { date; date; } 09 139 166 189 292 313 346 4717 4717 date; { date; } 10 149 175 198 310 331 376 4729 4729 . _tmp/sourced.sh 11 47 72 73 174 184 230 4618 4618 (echo hi) 12 97 122 133 239 262 283 4667 4667 (date) 13 97 122 133 247 270 289 4667 4667 ( ( date ) ) 14 98 123 134 249 272 293 4669 4669 ( ( date ) ); echo hi 15 98 123 134 241 264 287 4669 4669 echo hi; (date) 16 98 123 134 241 264 287 4669 4669 echo hi; (date;) 17 48 73 74 175 185 234 4619 4619 echo hi; (echo hi;) 18 99 124 147 242 285 291 4670 4670 echo hi; (echo hi; date) 19 48 73 74 176 186 234 4620 4620 ( echo hi ); echo hi 20 105 128 139 234 257 280 4676 4676 date > /tmp/redir.txt 21 100 125 141 242 265 286 4676 4676 (date;) > /tmp/sentence.txt 22 164 187 231 321 355 366 4746 4746 date 2> /tmp/stderr.txt | wc -l 23 48 70 66 154 166 204 4613 4613 echo hi > /tmp/redir.txt 24 50 75 81 177 187 232 4627 4627 (echo hi;) > /tmp/sentence.txt 25 116 139 174 264 285 315 4699 4699 echo hi 2> /tmp/stderr.txt | wc -l 26 105 130 146 262 284 314 4683 4683 (date; echo hi) 27 106 131 154 250 292 296 4676 4676 echo $(date) 28 55 81 93 185 194 240 4627 4627 echo $(echo hi) 29 106 131 154 279 300 302 4676 4676 echo $( ( date ) ) 30 114 140 169 282 303 331 4693 4693 echo $( ( date ); echo hi ) 31 48 73 74 176 186 234 4620 4620 ( echo hi ); echo done 32 158 183 226 318 352 363 4739 4739 date | wc -l 33 158 183 226 318 352 363 4604 4739 ! date | wc -l 34 108 133 167 261 282 313 4690 4690 echo a | wc -l 35 108 133 167 261 282 356 4690 4690 command echo a | wc -l 36 158 183 226 318 380 363 4739 4739 command date | wc -l 37 158 183 226 318 380 363 4604 4739 ! command date | wc -l 38 158 183 226 326 360 370 4739 4739 ( date ) | wc -l 39 141 195 200 298 318 322 4709 4709 date | read x 40 109 134 168 262 283 319 4691 4691 { echo a; echo b; } | wc -l 41 110 135 169 264 285 323 4693 4693 { echo a; echo b; } | wc -l; echo done 42 160 185 241 350 383 377 4741 4742 { echo a; date; } | wc -l 43 109 134 168 262 283 320 4691 4691 ( echo a; echo b ) | wc -l 44 109 134 168 272 293 327 4691 4691 ( echo a; echo b ) | ( wc -l ) 45 110 135 183 302 322 338 4692 4692 { echo prefix; ( echo a; echo b ); } | ( wc -l ) 46 54 78 82 201 210 238 4619 4619 echo hi & wait 47 104 128 142 258 280 288 4668 4668 date & wait 48 117 139 178 287 307 330 4687 4687 echo hi | wc -l & wait 49 167 189 237 344 377 379 4736 4736 date | wc -l & wait 50 105 129 143 296 318 293 4670 4670 trap 'echo mytrap' EXIT; date & wait 51 168 190 238 398 431 384 4738 4738 trap 'echo mytrap' EXIT; date | wc -l & wait 52 112 136 153 326 346 323 4682 4682 { trap 'echo mytrap' EXIT; date; } & wait TOTAL 5567 6881 8002 13491 14711 15805 243155 243426