Number of Syscalls ID dash ash mksh bash-5 zsh bash-4 ysh osh Description 01 47 69 66 156 184 168 4876 4877 echo hi 02 130 153 164 269 289 292 4964 4965 date 03 49 71 66 157 179 169 4876 4877 date ; 04 131 154 165 305 296 328 4966 4967 trap 'echo mytrap' EXIT; date 05 131 154 165 271 293 294 4966 4967 date; echo hi 06 131 154 165 271 293 294 4966 4967 echo hi; date 07 199 224 249 357 383 378 5040 5041 date; date 08 199 224 249 357 384 378 5040 5041 { date; date; } 09 199 224 249 357 384 378 5040 5041 date; { date; } 10 209 233 258 375 414 396 5052 5053 . _tmp/sourced.sh 11 55 78 81 187 217 197 4890 4891 (echo hi) 12 130 153 166 277 295 300 4964 4965 (date) 13 130 153 166 285 301 308 4964 4965 ( ( date ) ) 14 131 154 167 287 305 310 4966 4967 ( ( date ) ); echo hi 15 131 154 167 279 299 302 4966 4967 echo hi; (date) 16 131 154 167 279 299 302 4966 4967 echo hi; (date;) 17 56 79 82 188 221 198 4891 4892 echo hi; (echo hi;) 18 132 155 181 280 303 324 4967 4968 echo hi; (echo hi; date) 19 56 79 82 189 221 199 4892 4893 ( echo hi ); echo hi 20 138 159 172 272 292 295 4973 4974 date > /tmp/redir.txt 21 133 156 174 280 298 303 4973 4974 (date;) > /tmp/sentence.txt 22 225 246 292 387 405 421 5070 5071 date 2> /tmp/stderr.txt | wc -l 23 55 75 73 166 191 178 4885 4886 echo hi > /tmp/redir.txt 24 58 81 89 190 219 200 4899 4900 (echo hi;) > /tmp/sentence.txt 25 152 173 210 305 329 326 4998 4999 echo hi 2> /tmp/stderr.txt | wc -l 26 139 162 180 301 326 323 4980 4981 (date; echo hi) 27 139 162 187 288 308 331 4973 4974 echo $(date) 28 63 87 101 198 227 207 4899 4900 echo $(echo hi) 29 139 162 187 318 314 339 4973 4974 echo $( ( date ) ) 30 148 172 203 321 343 342 4990 4991 echo $( ( date ); echo hi ) 31 56 79 82 189 221 199 4892 4893 ( echo hi ); echo done 32 219 242 287 384 402 418 5063 5064 date | wc -l 33 219 242 287 384 402 418 4876 5064 ! date | wc -l 34 144 167 203 302 327 323 4989 4990 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 5063 5064 command date | wc -l 37 219 242 287 384 402 447 4876 5064 ! command date | wc -l 38 219 242 287 392 409 426 5063 5064 ( date ) | wc -l 39 175 227 234 337 334 357 5006 5007 date | read x 40 145 168 204 303 333 324 4990 4991 { echo a; echo b; } | wc -l 41 146 169 205 305 337 326 4992 4993 { echo a; echo b; } | wc -l; echo done 42 221 244 303 417 416 450 5066 5066 { echo a; date; } | wc -l 43 145 168 204 303 334 324 4990 4991 ( echo a; echo b ) | wc -l 44 145 168 204 313 341 334 4990 4991 ( echo a; echo b ) | ( wc -l ) 45 146 169 220 344 352 364 4991 4992 { echo prefix; ( echo a; echo b ); } | ( wc -l ) 46 62 84 90 214 225 223 4889 4890 echo hi & wait 47 137 159 175 296 300 318 4963 4964 date & wait 48 153 173 214 328 344 348 4984 4985 echo hi | wc -l & wait 49 228 248 298 410 418 443 5058 5059 date | wc -l & wait 50 138 160 176 332 305 354 4965 4966 trap 'echo mytrap' EXIT; date & wait 51 229 249 300 462 423 495 5060 5061 trap 'echo mytrap' EXIT; date | wc -l & wait 52 146 168 187 363 335 383 4977 4978 { trap 'echo mytrap' EXIT; date; } & wait TOTAL 7421 8631 9860 15600 16569 16824 258597 259022