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 4893 4894 echo hi 02 114 136 141 141 222 235 246 4974 4960 date 03 114 136 141 156 222 235 246 4974 4960 date ; 04 123 146 158 157 283 266 305 4896 4977 trap 'echo mytrap' EXIT; date 05 123 146 154 157 249 263 271 4973 4975 date; echo hi 06 115 137 145 157 224 239 271 4974 4960 echo hi; date 07 183 207 217 241 310 329 355 5050 5036 date; date 08 183 207 217 241 335 330 355 5048 5034 { date; date; } 09 183 207 217 241 335 330 355 5048 5034 date; { date; } 10 201 225 240 250 353 384 373 5061 5062 . _tmp/sourced.sh 11 47 69 75 81 173 171 182 4892 4894 (echo hi) 12 114 136 142 158 255 241 277 4893 4960 (date) 13 114 136 143 158 263 247 285 4891 4957 ( ( date ) ) 14 123 146 156 159 265 275 287 4891 4975 ( ( date ) ); echo hi 15 115 137 146 159 257 245 279 4891 4960 echo hi; (date) 16 115 137 146 159 257 245 279 4891 4960 echo hi; (date;) 17 48 70 78 82 174 175 183 4891 4893 echo hi; (echo hi;) 18 116 138 149 173 258 249 301 4890 4961 echo hi; (echo hi; date) 19 56 79 88 82 175 199 184 4891 4907 ( echo hi ); echo hi 20 120 140 146 164 250 241 272 4981 4965 date > /tmp/redir.txt 21 117 139 161 166 258 244 280 4891 4964 (date;) > /tmp/sentence.txt 22 208 230 227 276 357 367 390 5073 5055 date 2> /tmp/stderr.txt | wc -l 23 55 75 82 73 152 169 163 4900 4901 echo hi > /tmp/redir.txt 24 50 72 85 89 176 173 185 4893 4903 (echo hi;) > /tmp/sentence.txt 25 143 165 163 202 283 299 303 5008 4990 echo hi 2> /tmp/stderr.txt | wc -l 26 123 146 155 172 279 272 300 4890 4975 (date; echo hi) 27 131 154 166 179 266 278 308 4981 4982 echo $(date) 28 63 87 99 101 184 205 192 4914 4915 echo $(echo hi) 29 131 154 167 179 296 284 316 4891 4982 echo $( ( date ) ) 30 140 164 181 195 299 313 319 4891 4999 echo $( ( date ); echo hi ) 31 56 79 88 82 175 199 184 4891 4908 ( echo hi ); echo done 32 202 226 222 271 354 364 387 5064 5046 date | wc -l 33 202 226 239 271 354 364 387 4891 5065 ! date | wc -l 34 136 159 155 195 280 297 300 4996 4979 echo a | wc -l 35 135 159 155 195 280 357 300 4997 4979 command echo a | wc -l 36 202 226 231 272 354 364 416 5064 5046 command date | wc -l 37 202 226 248 271 354 364 416 4891 5065 ! command date | wc -l 38 202 226 222 272 362 371 395 4891 5046 ( date ) | wc -l 39 166 219 213 226 315 304 334 5014 5015 date | read x 40 136 160 158 196 281 276 301 4998 4979 { echo a; echo b; } | wc -l 41 138 161 177 197 283 307 303 5003 5006 { echo a; echo b; } | wc -l; echo done 42 204 228 227 286 387 348 419 5066 5049 { echo a; date; } | wc -l 43 136 160 158 196 281 304 301 4891 4980 ( echo a; echo b ) | wc -l 44 136 160 159 196 291 311 311 4893 4982 ( echo a; echo b ) | ( wc -l ) 45 137 161 163 212 322 290 341 4893 4983 { echo prefix; ( echo a; echo b ); } | ( wc -l ) 46 62 84 92 90 200 201 210 4891 4904 echo hi & wait 47 129 151 159 167 274 268 297 4892 4974 date & wait 48 149 169 182 206 306 312 327 4891 4993 echo hi | wc -l & wait 49 213 232 249 282 380 378 414 4891 5060 date | wc -l & wait 50 130 152 167 168 310 275 333 4893 4976 trap 'echo mytrap' EXIT; date & wait 51 213 233 257 284 432 385 466 4893 5064 trap 'echo mytrap' EXIT; date | wc -l & wait 52 138 160 176 179 341 303 362 4892 4988 { trap 'echo mytrap' EXIT; date; } & wait TOTAL 6939 8147 8556 9528 14468 14607 15719 256911 259077