Number of Syscalls ID dash ash mksh bash-5 bash-4 zsh ysh osh Description 01 40 64 59 144 156 197 4608 4608 echo hi 02 97 122 131 231 254 277 4671 4671 date 03 42 66 59 145 157 192 4608 4608 date ; 04 98 123 132 269 292 284 4673 4673 trap 'echo mytrap' EXIT; date 05 98 123 132 233 256 281 4673 4673 date; echo hi 06 98 123 132 233 256 281 4673 4673 echo hi; date 07 139 166 189 292 313 345 4721 4721 date; date 08 139 166 189 292 313 346 4721 4721 { date; date; } 09 139 166 189 292 313 346 4721 4721 date; { date; } 10 149 175 198 310 331 376 4733 4733 . _tmp/sourced.sh 11 47 72 73 174 184 230 4622 4622 (echo hi) 12 97 122 133 239 262 283 4671 4671 (date) 13 97 122 133 247 270 289 4671 4671 ( ( date ) ) 14 98 123 134 249 272 293 4671 4671 ( ( date ) ); echo hi 15 98 123 134 241 264 287 4673 4673 echo hi; (date) 16 98 123 134 241 264 287 4673 4673 echo hi; (date;) 17 48 73 74 175 185 234 4623 4623 echo hi; (echo hi;) 18 99 124 147 242 285 291 4672 4672 echo hi; (echo hi; date) 19 48 73 74 176 186 234 4622 4622 ( echo hi ); echo hi 20 105 128 139 234 257 280 4678 4678 date > /tmp/redir.txt 21 100 125 141 242 265 286 4678 4678 (date;) > /tmp/sentence.txt 22 164 187 231 321 355 366 4750 4750 date 2> /tmp/stderr.txt | wc -l 23 48 70 66 154 166 204 4615 4615 echo hi > /tmp/redir.txt 24 50 75 81 177 187 232 4631 4631 (echo hi;) > /tmp/sentence.txt 25 116 139 174 264 285 315 4703 4703 echo hi 2> /tmp/stderr.txt | wc -l 26 105 130 146 262 284 314 4687 4687 (date; echo hi) 27 106 131 154 250 292 296 4680 4680 echo $(date) 28 55 81 93 185 194 240 4631 4631 echo $(echo hi) 29 106 131 154 279 300 302 4680 4680 echo $( ( date ) ) 30 114 140 169 282 303 331 4695 4695 echo $( ( date ); echo hi ) 31 48 73 74 176 186 234 4622 4622 ( echo hi ); echo done 32 158 183 226 318 352 363 4743 4743 date | wc -l 33 158 183 226 318 352 363 4608 4743 ! date | wc -l 34 108 133 167 261 282 313 4694 4694 echo a | wc -l 35 108 133 167 261 282 356 4692 4692 command echo a | wc -l 36 158 183 227 318 380 363 4741 4741 command date | wc -l 37 158 183 226 318 380 363 4606 4741 ! command date | wc -l 38 158 183 226 326 360 370 4743 4743 ( date ) | wc -l 39 141 195 200 298 318 322 4713 4713 date | read x 40 109 134 168 262 283 319 4693 4693 { echo a; echo b; } | wc -l 41 110 135 169 264 285 323 4697 4697 { echo a; echo b; } | wc -l; echo done 42 160 185 241 350 383 377 4744 4744 { echo a; date; } | wc -l 43 109 134 168 262 283 320 4693 4693 ( echo a; echo b ) | wc -l 44 109 134 168 272 293 327 4695 4695 ( echo a; echo b ) | ( wc -l ) 45 110 135 183 302 322 338 4696 4696 { echo prefix; ( echo a; echo b ); } | ( wc -l ) 46 54 78 82 201 210 238 4623 4623 echo hi & wait 47 104 128 142 258 280 288 4672 4672 date & wait 48 117 139 178 287 307 330 4689 4689 echo hi | wc -l & wait 49 167 192 237 344 377 379 4740 4740 date | wc -l & wait 50 105 129 143 296 318 293 4674 4674 trap 'echo mytrap' EXIT; date & wait 51 169 190 238 398 431 384 4742 4742 trap 'echo mytrap' EXIT; date | wc -l & wait 52 112 136 153 326 346 323 4686 4686 { trap 'echo mytrap' EXIT; date; } & wait TOTAL 5568 6884 8003 13491 14711 15805 243334 243604