Number of Syscalls ID dash ash yash mksh bash-5 zsh bash-4 ysh-py osh-py Description 01 47 69 74 66 142 162 153 4849 4850 echo hi 02 114 136 141 141 222 235 246 4930 4916 date 03 114 136 141 156 222 235 246 4930 4916 date ; 04 123 146 158 157 283 266 305 4870 4951 trap 'echo mytrap' EXIT; date 05 123 146 154 157 249 263 271 4902 4903 date; echo hi 06 115 137 145 157 224 239 271 4902 4888 echo hi; date 07 183 207 217 241 310 329 355 5006 4992 date; date 08 183 207 217 241 335 330 355 4976 4962 { date; date; } 09 183 207 217 241 335 330 355 4976 4962 date; { date; } 10 201 225 240 250 353 384 373 4989 4990 . _tmp/sourced.sh 11 47 69 75 81 173 171 182 4849 4850 (echo hi) 12 114 136 142 158 255 241 277 4849 4916 (date) 13 114 136 143 158 263 247 285 4819 4886 ( ( date ) ) 14 123 146 156 159 265 275 287 4819 4903 ( ( date ) ); echo hi 15 115 137 146 159 257 245 279 4819 4888 echo hi; (date) 16 115 137 146 159 257 245 279 4819 4888 echo hi; (date;) 17 48 70 78 82 174 175 183 4819 4821 echo hi; (echo hi;) 18 116 138 149 173 258 249 301 4819 4889 echo hi; (echo hi; date) 19 56 79 88 82 175 199 184 4819 4836 ( echo hi ); echo hi 20 120 140 146 164 250 241 272 4909 4893 date > /tmp/redir.txt 21 117 139 161 166 258 244 280 4819 4893 (date;) > /tmp/sentence.txt 22 208 230 227 276 357 368 390 5047 5029 date 2> /tmp/stderr.txt | wc -l 23 55 75 82 73 152 169 163 4828 4829 echo hi > /tmp/redir.txt 24 50 72 85 89 176 173 185 4867 4877 (echo hi;) > /tmp/sentence.txt 25 143 165 163 202 283 299 303 4982 4964 echo hi 2> /tmp/stderr.txt | wc -l 26 123 146 155 172 279 272 300 4819 4903 (date; echo hi) 27 131 154 166 179 266 278 308 4909 4910 echo $(date) 28 63 87 99 101 184 205 192 4842 4843 echo $(echo hi) 29 131 154 167 179 296 284 316 4819 4910 echo $( ( date ) ) 30 140 164 181 195 299 313 319 4819 4927 echo $( ( date ); echo hi ) 31 56 79 88 82 175 199 184 4819 4836 ( echo hi ); echo done 32 202 226 222 271 354 365 387 4992 4974 date | wc -l 33 202 226 239 271 354 364 387 4819 4993 ! date | wc -l 34 135 159 155 195 280 297 300 4925 4907 echo a | wc -l 35 135 159 155 195 280 357 300 4925 4907 command echo a | wc -l 36 202 226 231 271 354 364 416 4992 4974 command date | wc -l 37 202 226 248 271 354 364 416 4819 4993 ! command date | wc -l 38 202 226 222 271 362 371 395 4819 4974 ( date ) | wc -l 39 166 219 213 226 315 304 334 4942 4943 date | read x 40 136 160 158 196 281 276 301 4926 4908 { echo a; echo b; } | wc -l 41 138 161 177 197 283 307 303 4976 4977 { echo a; echo b; } | wc -l; echo done 42 204 228 227 287 387 348 419 4995 4977 { echo a; date; } | wc -l 43 136 160 158 196 281 304 301 4819 4908 ( echo a; echo b ) | wc -l 44 136 160 159 196 291 311 311 4867 4956 ( echo a; echo b ) | ( wc -l ) 45 137 161 163 212 322 290 341 4851 4941 { echo prefix; ( echo a; echo b ); } | ( wc -l ) 46 62 84 92 90 200 201 210 4819 4833 echo hi & wait 47 129 151 159 167 274 268 297 4849 4930 date & wait 48 148 169 182 206 306 312 327 4819 4921 echo hi | wc -l & wait 49 216 232 249 282 380 378 414 4819 4988 date | wc -l & wait 50 130 152 167 168 310 275 333 4867 4950 trap 'echo mytrap' EXIT; date & wait 51 213 233 257 283 432 385 466 4851 5022 trap 'echo mytrap' EXIT; date | wc -l & wait 52 138 160 176 179 341 303 362 4867 4962 { trap 'echo mytrap' EXIT; date; } & wait TOTAL 6940 8147 8556 9526 14468 14609 15719 253798 255959