Number of Syscalls ID dash ash mksh bash-5 zsh bash-4 ysh osh Description 01 47 69 66 156 184 168 4878 4879 echo hi 02 130 153 164 269 289 292 4966 4967 date 03 49 71 66 157 179 169 4878 4879 date ; 04 131 154 165 305 296 328 4968 4969 trap 'echo mytrap' EXIT; date 05 131 154 165 271 293 294 4968 4969 date; echo hi 06 131 154 165 271 293 294 4968 4969 echo hi; date 07 199 224 249 357 383 378 5042 5043 date; date 08 199 224 249 357 384 378 5042 5043 { date; date; } 09 199 224 249 357 384 378 5042 5043 date; { date; } 10 209 233 258 375 414 396 5054 5055 . _tmp/sourced.sh 11 55 78 81 187 217 197 4892 4893 (echo hi) 12 130 153 166 277 295 300 4966 4967 (date) 13 130 153 166 285 301 308 4966 4967 ( ( date ) ) 14 131 154 167 287 305 310 4968 4969 ( ( date ) ); echo hi 15 131 154 167 279 299 302 4968 4969 echo hi; (date) 16 131 154 167 279 299 302 4968 4969 echo hi; (date;) 17 56 79 82 188 221 198 4893 4894 echo hi; (echo hi;) 18 132 155 181 280 303 324 4969 4970 echo hi; (echo hi; date) 19 56 79 82 189 221 199 4894 4895 ( echo hi ); echo hi 20 138 159 172 272 292 295 4975 4976 date > /tmp/redir.txt 21 133 156 174 280 298 303 4975 4976 (date;) > /tmp/sentence.txt 22 225 246 292 387 405 421 5072 5073 date 2> /tmp/stderr.txt | wc -l 23 55 75 73 166 191 178 4887 4888 echo hi > /tmp/redir.txt 24 58 81 89 190 219 200 4901 4902 (echo hi;) > /tmp/sentence.txt 25 152 173 210 305 329 326 5000 5001 echo hi 2> /tmp/stderr.txt | wc -l 26 139 162 180 301 326 323 4982 4983 (date; echo hi) 27 139 162 187 288 308 331 4975 4976 echo $(date) 28 63 87 101 198 227 207 4901 4902 echo $(echo hi) 29 139 162 187 318 314 339 4975 4976 echo $( ( date ) ) 30 148 172 203 321 343 342 4992 4993 echo $( ( date ); echo hi ) 31 56 79 82 189 221 199 4894 4895 ( echo hi ); echo done 32 219 242 287 384 402 418 5065 5066 date | wc -l 33 219 242 287 384 402 418 4878 5066 ! date | wc -l 34 144 167 203 302 327 323 4991 4992 echo a | wc -l 35 144 167 203 302 395 323 4991 4992 command echo a | wc -l 36 219 242 287 384 402 447 5065 5066 command date | wc -l 37 219 242 287 384 402 447 4878 5066 ! command date | wc -l 38 219 242 287 392 409 426 5065 5066 ( date ) | wc -l 39 175 227 234 337 334 357 5008 5009 date | read x 40 145 168 204 303 333 324 4992 4993 { echo a; echo b; } | wc -l 41 146 169 205 305 337 326 4994 4995 { echo a; echo b; } | wc -l; echo done 42 221 244 303 417 416 450 5067 5069 { echo a; date; } | wc -l 43 145 168 204 303 334 324 4992 4993 ( echo a; echo b ) | wc -l 44 145 168 204 313 341 334 4992 4993 ( echo a; echo b ) | ( wc -l ) 45 146 169 220 344 352 364 4993 4994 { echo prefix; ( echo a; echo b ); } | ( wc -l ) 46 62 84 90 214 225 223 4891 4892 echo hi & wait 47 137 159 175 296 300 318 4965 4966 date & wait 48 153 173 214 328 344 348 4986 4987 echo hi | wc -l & wait 49 232 252 298 410 418 443 5060 5061 date | wc -l & wait 50 138 160 176 332 305 354 4967 4968 trap 'echo mytrap' EXIT; date & wait 51 229 249 299 462 423 495 5062 5063 trap 'echo mytrap' EXIT; date | wc -l & wait 52 146 168 187 363 335 383 4979 4980 { trap 'echo mytrap' EXIT; date; } & wait TOTAL 7425 8635 9859 15600 16569 16824 258700 259127