Number of Syscalls ID dash ash mksh bash-5 bash-4 zsh ysh osh Description 01 40 64 59 144 156 197 4811 4810 echo hi 02 97 122 131 231 254 277 4875 4874 date 03 42 66 59 145 157 192 4811 4810 date ; 04 98 123 132 269 292 284 4907 4878 trap 'echo mytrap' EXIT; date 05 98 123 132 233 256 281 4879 4878 date; echo hi 06 98 123 132 233 256 281 4879 4878 echo hi; date 07 139 166 189 292 313 345 4925 4924 date; date 08 139 166 189 292 313 346 4928 4926 { date; date; } 09 139 166 189 292 313 346 4928 4927 date; { date; } 10 149 175 198 310 331 376 4941 4938 . _tmp/sourced.sh 11 47 72 73 174 184 230 4826 4825 (echo hi) 12 97 122 133 239 262 283 4874 4873 (date) 13 97 122 133 247 270 289 4879 4877 ( ( date ) ) 14 98 123 134 249 272 293 4889 4884 ( ( date ) ); echo hi 15 98 123 134 241 264 287 4879 4878 echo hi; (date) 16 98 123 134 241 264 287 4879 4878 echo hi; (date;) 17 48 73 74 175 185 234 4829 4828 echo hi; (echo hi;) 18 99 124 147 242 285 291 4880 4879 echo hi; (echo hi; date) 19 48 73 74 176 186 234 4831 4830 ( echo hi ); echo hi 20 105 128 139 234 257 280 4888 4885 date > /tmp/redir.txt 21 100 125 141 242 265 286 4886 4885 (date;) > /tmp/sentence.txt 22 164 187 231 321 355 366 4957 4956 date 2> /tmp/stderr.txt | wc -l 23 48 70 66 154 166 204 4823 4826 echo hi > /tmp/redir.txt 24 50 75 81 177 187 232 4837 4836 (echo hi;) > /tmp/sentence.txt 25 116 139 174 264 285 315 4910 4909 echo hi 2> /tmp/stderr.txt | wc -l 26 105 130 146 262 284 314 4894 4892 (date; echo hi) 27 106 131 154 250 292 296 4889 4901 echo $(date) 28 55 81 93 185 194 240 4840 4843 echo $(echo hi) 29 106 131 154 279 300 302 4887 4898 echo $( ( date ) ) 30 114 140 169 282 303 331 4904 4904 echo $( ( date ); echo hi ) 31 48 73 74 176 186 234 4831 4830 ( echo hi ); echo done 32 158 183 226 318 352 363 4949 4949 date | wc -l 33 158 183 226 318 352 363 4813 4951 ! date | wc -l 34 108 133 167 261 282 313 4901 4900 echo a | wc -l 35 108 133 167 261 282 356 4905 4903 command echo a | wc -l 36 158 183 226 318 380 363 4954 4949 command date | wc -l 37 158 183 226 318 380 363 4813 4949 ! command date | wc -l 38 158 183 226 326 360 369 4950 4949 ( date ) | wc -l 39 141 195 200 298 318 322 4919 4919 date | read x 40 109 134 168 262 283 319 4902 4901 { echo a; echo b; } | wc -l 41 110 135 169 264 285 323 4904 4903 { echo a; echo b; } | wc -l; echo done 42 160 185 241 350 383 377 4953 4952 { echo a; date; } | wc -l 43 109 134 168 262 283 320 4902 4901 ( echo a; echo b ) | wc -l 44 109 134 168 272 293 327 4902 4901 ( echo a; echo b ) | ( wc -l ) 45 110 135 183 302 322 338 4903 4902 { echo prefix; ( echo a; echo b ); } | ( wc -l ) 46 54 78 82 201 210 238 4830 4829 echo hi & wait 47 104 128 142 258 280 288 4880 4879 date & wait 48 117 139 178 287 307 330 4899 4897 echo hi | wc -l & wait 49 168 189 237 344 377 379 4957 4947 date | wc -l & wait 50 105 129 143 296 318 293 4884 4879 trap 'echo mytrap' EXIT; date & wait 51 169 190 239 398 431 384 4948 4951 trap 'echo mytrap' EXIT; date | wc -l & wait 52 112 136 153 326 346 323 4895 4892 { trap 'echo mytrap' EXIT; date; } & wait TOTAL 5569 6881 8003 13491 14711 15804 254159 254363