Number of Syscalls ID dash ash mksh bash-5 bash-4 zsh ysh osh Description 01 40 64 59 144 156 197 4829 4828 echo hi 02 97 122 131 231 254 277 4892 4891 date 03 42 66 59 145 157 192 4828 4827 date ; 04 98 123 132 269 292 284 4894 4893 trap 'echo mytrap' EXIT; date 05 98 123 132 233 256 281 4894 4893 date; echo hi 06 98 123 132 233 256 281 4894 4893 echo hi; date 07 139 166 189 292 313 345 4942 4941 date; date 08 139 166 189 292 313 346 4942 4941 { date; date; } 09 139 166 189 292 313 346 4942 4941 date; { date; } 10 149 175 198 310 331 376 4954 4953 . _tmp/sourced.sh 11 47 72 73 174 184 230 4843 4842 (echo hi) 12 97 122 133 239 262 283 4892 4891 (date) 13 97 122 133 247 270 289 4894 4892 ( ( date ) ) 14 98 123 134 249 272 293 4894 4894 ( ( date ) ); echo hi 15 98 123 134 241 264 287 4894 4893 echo hi; (date) 16 98 123 134 241 264 287 4894 4893 echo hi; (date;) 17 48 73 74 175 185 234 4844 4843 echo hi; (echo hi;) 18 99 124 147 242 285 291 4895 4894 echo hi; (echo hi; date) 19 48 73 74 176 186 234 4845 4844 ( echo hi ); echo hi 20 105 128 139 234 257 280 4901 4900 date > /tmp/redir.txt 21 100 125 141 242 265 286 4903 4902 (date;) > /tmp/sentence.txt 22 164 187 231 321 355 366 4971 4970 date 2> /tmp/stderr.txt | wc -l 23 48 70 66 154 166 204 4838 4837 echo hi > /tmp/redir.txt 24 50 75 81 177 187 232 4854 4853 (echo hi;) > /tmp/sentence.txt 25 116 139 174 264 285 315 4924 4923 echo hi 2> /tmp/stderr.txt | wc -l 26 105 130 146 262 284 314 4908 4907 (date; echo hi) 27 106 131 154 250 292 296 4901 4900 echo $(date) 28 55 81 93 185 194 240 4852 4851 echo $(echo hi) 29 106 131 154 279 300 302 4901 4901 echo $( ( date ) ) 30 114 140 169 282 303 331 4918 4918 echo $( ( date ); echo hi ) 31 48 73 74 176 186 234 4845 4844 ( echo hi ); echo done 32 158 183 226 318 352 363 4964 4963 date | wc -l 33 158 183 226 318 352 363 4829 4963 ! date | wc -l 34 108 133 167 261 282 313 4915 4914 echo a | wc -l 35 108 133 167 261 282 356 4915 4914 command echo a | wc -l 36 158 183 226 318 380 363 4964 4963 command date | wc -l 37 158 183 226 318 380 363 4829 4963 ! command date | wc -l 38 158 183 226 326 360 369 4964 4963 ( date ) | wc -l 39 141 195 200 298 318 322 4934 4933 date | read x 40 109 134 168 262 283 319 4916 4915 { echo a; echo b; } | wc -l 41 110 135 169 264 285 323 4918 4917 { echo a; echo b; } | wc -l; echo done 42 160 185 241 350 383 377 4967 4966 { echo a; date; } | wc -l 43 109 134 168 262 283 320 4916 4915 ( echo a; echo b ) | wc -l 44 109 134 168 272 293 327 4916 4915 ( echo a; echo b ) | ( wc -l ) 45 110 135 183 302 322 338 4917 4916 { echo prefix; ( echo a; echo b ); } | ( wc -l ) 46 54 78 82 201 210 238 4844 4844 echo hi & wait 47 104 128 142 258 280 288 4893 4897 date & wait 48 117 139 178 287 307 330 4912 4911 echo hi | wc -l & wait 49 167 189 237 344 377 379 4961 4960 date | wc -l & wait 50 105 129 143 296 318 293 4895 4894 trap 'echo mytrap' EXIT; date & wait 51 168 194 238 398 431 384 4963 4966 trap 'echo mytrap' EXIT; date | wc -l & wait 52 112 136 153 326 346 323 4907 4907 { trap 'echo mytrap' EXIT; date; } & wait TOTAL 5567 6885 8002 13491 14711 15804 254861 255092