Number of Syscalls ID dash ash mksh bash-5 zsh bash-4 ysh osh Description 01 47 69 66 156 184 168 4875 4876 echo hi 02 130 153 164 269 289 292 4963 4964 date 03 49 71 66 157 179 169 4875 4876 date ; 04 131 154 165 305 296 328 4965 4966 trap 'echo mytrap' EXIT; date 05 131 154 165 271 293 294 4965 4966 date; echo hi 06 131 154 165 271 293 294 4965 4966 echo hi; date 07 199 224 249 357 383 378 5039 5040 date; date 08 199 224 249 357 384 378 5039 5040 { date; date; } 09 199 224 249 357 384 378 5039 5040 date; { date; } 10 209 233 258 375 414 396 5051 5052 . _tmp/sourced.sh 11 55 78 81 187 217 197 4889 4890 (echo hi) 12 130 153 166 277 295 300 4963 4964 (date) 13 130 153 166 285 301 308 4963 4964 ( ( date ) ) 14 131 154 167 287 305 310 4965 4966 ( ( date ) ); echo hi 15 131 154 167 279 299 302 4965 4966 echo hi; (date) 16 131 154 167 279 299 302 4965 4966 echo hi; (date;) 17 56 79 82 188 221 198 4890 4891 echo hi; (echo hi;) 18 132 155 181 280 303 324 4966 4967 echo hi; (echo hi; date) 19 56 79 82 189 221 199 4891 4892 ( echo hi ); echo hi 20 138 159 172 272 292 295 4972 4973 date > /tmp/redir.txt 21 133 156 174 280 298 303 4972 4973 (date;) > /tmp/sentence.txt 22 225 246 292 387 405 421 5069 5070 date 2> /tmp/stderr.txt | wc -l 23 55 75 73 166 191 178 4884 4885 echo hi > /tmp/redir.txt 24 58 81 89 190 219 200 4898 4899 (echo hi;) > /tmp/sentence.txt 25 152 173 210 305 329 326 4997 4998 echo hi 2> /tmp/stderr.txt | wc -l 26 139 162 180 301 326 323 4979 4980 (date; echo hi) 27 139 162 187 288 308 331 4972 4973 echo $(date) 28 63 87 101 198 227 207 4898 4899 echo $(echo hi) 29 139 162 187 318 314 339 4972 4973 echo $( ( date ) ) 30 148 172 203 321 343 342 4989 4990 echo $( ( date ); echo hi ) 31 56 79 82 189 221 199 4891 4892 ( echo hi ); echo done 32 219 242 287 384 402 418 5062 5063 date | wc -l 33 219 242 288 384 402 418 4875 5063 ! date | wc -l 34 144 167 203 302 327 323 4988 4989 echo a | wc -l 35 144 167 203 302 395 323 4989 4990 command echo a | wc -l 36 219 242 287 384 402 447 5062 5063 command date | wc -l 37 219 242 287 384 402 447 4875 5063 ! command date | wc -l 38 219 242 287 392 409 426 5062 5063 ( date ) | wc -l 39 175 227 234 337 334 357 5005 5006 date | read x 40 145 168 204 303 333 324 4989 4990 { echo a; echo b; } | wc -l 41 146 169 205 305 337 326 4991 4992 { echo a; echo b; } | wc -l; echo done 42 221 244 302 417 416 450 5065 5065 { echo a; date; } | wc -l 43 145 168 204 303 334 324 4989 4990 ( echo a; echo b ) | wc -l 44 145 168 204 313 341 334 4989 4990 ( echo a; echo b ) | ( wc -l ) 45 146 169 220 344 352 364 4990 4991 { echo prefix; ( echo a; echo b ); } | ( wc -l ) 46 62 84 90 214 225 223 4888 4889 echo hi & wait 47 137 159 175 296 300 318 4962 4963 date & wait 48 153 173 214 328 344 348 4983 4984 echo hi | wc -l & wait 49 228 248 298 410 418 443 5057 5058 date | wc -l & wait 50 138 160 176 332 305 354 4964 4965 trap 'echo mytrap' EXIT; date & wait 51 233 249 299 462 423 495 5059 5060 trap 'echo mytrap' EXIT; date | wc -l & wait 52 146 168 187 363 335 383 4976 4977 { trap 'echo mytrap' EXIT; date; } & wait TOTAL 7425 8631 9859 15600 16569 16824 258546 258971