Number of Syscalls ID dash ash mksh bash-5 bash-4 zsh ysh osh Description 01 40 64 59 144 156 197 4849 4850 echo hi 02 97 122 131 231 254 277 4912 4913 date 03 42 66 59 145 157 192 4849 4850 date ; 04 98 123 132 269 292 284 4914 4915 trap 'echo mytrap' EXIT; date 05 98 123 132 233 256 281 4900 4901 date; echo hi 06 98 123 132 233 256 281 4900 4901 echo hi; date 07 139 166 189 292 313 345 4962 4963 date; date 08 139 166 189 292 313 346 4948 4949 { date; date; } 09 139 166 189 292 313 346 4948 4949 date; { date; } 10 149 175 198 310 331 376 4960 4961 . _tmp/sourced.sh 11 47 72 73 174 184 230 4863 4864 (echo hi) 12 97 122 133 239 262 283 4912 4913 (date) 13 97 122 133 247 270 289 4898 4899 ( ( date ) ) 14 98 123 134 249 272 293 4914 4913 ( ( date ) ); echo hi 15 98 123 134 241 264 287 4900 4901 echo hi; (date) 16 98 123 134 241 264 287 4900 4901 echo hi; (date;) 17 48 73 74 175 185 234 4850 4849 echo hi; (echo hi;) 18 99 124 147 242 285 291 4915 4914 echo hi; (echo hi; date) 19 48 73 74 176 186 234 4865 4864 ( echo hi ); echo hi 20 105 128 139 234 257 280 4921 4920 date > /tmp/redir.txt 21 100 125 141 242 265 286 4921 4920 (date;) > /tmp/sentence.txt 22 164 187 231 321 355 366 4991 4992 date 2> /tmp/stderr.txt | wc -l 23 48 70 66 154 166 204 4858 4857 echo hi > /tmp/redir.txt 24 50 75 81 177 187 232 4872 4873 (echo hi;) > /tmp/sentence.txt 25 116 139 174 264 285 315 4944 4945 echo hi 2> /tmp/stderr.txt | wc -l 26 105 130 146 262 284 314 4914 4915 (date; echo hi) 27 106 131 154 250 292 296 4907 4908 echo $(date) 28 55 81 93 185 194 240 4858 4859 echo $(echo hi) 29 106 131 154 279 300 302 4907 4906 echo $( ( date ) ) 30 114 140 169 282 303 331 4938 4937 echo $( ( date ); echo hi ) 31 48 73 74 176 186 234 4865 4864 ( echo hi ); echo done 32 158 183 226 318 352 363 4970 4971 date | wc -l 33 158 183 226 318 352 363 4835 4971 ! date | wc -l 34 108 133 167 261 282 313 4921 4922 echo a | wc -l 35 108 133 167 261 282 356 4935 4934 command echo a | wc -l 36 158 183 226 318 380 363 4984 4983 command date | wc -l 37 158 183 226 318 380 363 4849 4983 ! command date | wc -l 38 158 183 227 326 360 370 4970 4971 ( date ) | wc -l 39 141 195 200 298 318 322 4940 4941 date | read x 40 109 134 168 262 283 319 4936 4935 { echo a; echo b; } | wc -l 41 110 135 169 264 285 323 4938 4939 { echo a; echo b; } | wc -l; echo done 42 160 185 241 350 383 377 4987 4986 { echo a; date; } | wc -l 43 109 134 168 262 283 320 4936 4935 ( echo a; echo b ) | wc -l 44 109 134 168 272 293 327 4936 4937 ( echo a; echo b ) | ( wc -l ) 45 110 135 183 302 322 338 4939 4940 { echo prefix; ( echo a; echo b ); } | ( wc -l ) 46 54 78 82 201 210 238 4850 4851 echo hi & wait 47 104 128 142 258 280 288 4913 4914 date & wait 48 117 139 178 287 307 330 4932 4931 echo hi | wc -l & wait 49 168 193 238 344 377 379 4967 4966 date | wc -l & wait 50 105 129 143 296 318 293 4915 4916 trap 'echo mytrap' EXIT; date & wait 51 168 190 238 398 431 384 4985 4986 trap 'echo mytrap' EXIT; date | wc -l & wait 52 112 136 153 326 346 323 4927 4928 { trap 'echo mytrap' EXIT; date; } & wait TOTAL 5568 6885 8004 13491 14711 15805 255620 255906