Number of Syscalls ID dash yash ash mksh bash-5 bash-4 zsh ysh osh Description 01 40 49 64 59 144 156 194 4628 5800 echo hi 02 90 100 114 117 207 232 250 4691 4675 date 03 90 100 114 131 207 232 250 4691 4675 date ; 04 98 116 123 132 269 292 281 4685 4684 trap 'echo mytrap' EXIT; date 05 98 112 123 132 233 256 278 4685 4684 date; echo hi 06 91 104 115 132 209 256 254 4685 4669 echo hi; date 07 132 149 158 189 268 313 318 4741 4725 date; date 08 132 149 158 189 292 313 319 4733 4717 { date; date; } 09 132 149 158 189 292 313 319 4733 4717 date; { date; } 10 149 171 175 198 310 331 373 4745 4744 . _tmp/sourced.sh 11 40 50 64 73 174 184 203 4628 4627 (echo hi) 12 90 101 114 133 239 262 256 4691 4675 (date) 13 90 102 114 133 247 270 262 4683 4667 ( ( date ) ) 14 98 114 123 134 249 272 290 4685 4684 ( ( date ) ); echo hi 15 91 105 115 134 241 264 260 4685 4669 echo hi; (date) 16 91 105 115 134 241 264 260 4685 4669 echo hi; (date;) 17 41 53 65 74 175 185 207 4635 4620 echo hi; (echo hi;) 18 92 108 116 147 242 285 264 4686 4670 echo hi; (echo hi; date) 19 48 62 73 74 176 186 231 4636 4635 ( echo hi ); echo hi 20 96 105 118 139 234 257 256 4692 4674 date > /tmp/redir.txt 21 93 119 117 141 242 265 259 4692 4674 (date;) > /tmp/sentence.txt 22 163 167 187 231 321 355 363 4762 4742 date 2> /tmp/stderr.txt | wc -l 23 48 57 70 66 154 166 201 4629 4628 echo hi > /tmp/redir.txt 24 43 60 67 81 177 187 205 4643 4628 (echo hi;) > /tmp/sentence.txt 25 115 119 139 174 264 285 312 4715 4695 echo hi 2> /tmp/stderr.txt | wc -l 26 98 113 123 146 262 284 287 4685 4684 (date; echo hi) 27 106 124 131 154 250 292 293 4692 4691 echo $(date) 28 55 73 81 93 185 194 237 4643 4642 echo $(echo hi) 29 106 125 131 154 279 300 299 4692 4691 echo $( ( date ) ) 30 114 138 140 169 282 303 328 4709 4708 echo $( ( date ); echo hi ) 31 48 62 73 74 176 186 231 4636 4635 ( echo hi ); echo done 32 157 162 183 226 318 352 360 4755 4735 date | wc -l 33 157 177 183 226 318 352 360 4620 4754 ! date | wc -l 34 107 112 133 167 261 282 310 4706 4686 echo a | wc -l 35 107 112 133 167 261 282 353 4706 4686 command echo a | wc -l 36 157 170 183 226 318 380 360 4755 4735 command date | wc -l 37 157 186 183 226 318 380 360 4620 4754 ! command date | wc -l 38 157 162 183 227 326 360 367 4755 4735 ( date ) | wc -l 39 140 171 195 200 298 318 319 4725 4724 date | read x 40 108 115 134 168 262 283 289 4707 4687 { echo a; echo b; } | wc -l 41 110 132 135 169 264 285 320 4709 4708 { echo a; echo b; } | wc -l; echo done 42 159 167 185 241 350 383 344 4758 4738 { echo a; date; } | wc -l 43 108 115 134 168 262 283 317 4707 4687 ( echo a; echo b ) | wc -l 44 108 116 134 168 272 293 324 4707 4687 ( echo a; echo b ) | ( wc -l ) 45 109 120 135 183 302 322 303 4708 4688 { echo prefix; ( echo a; echo b ); } | ( wc -l ) 46 54 66 78 82 201 210 233 4635 4634 echo hi & wait 47 104 117 128 142 258 280 283 4692 4691 date & wait 48 117 137 139 178 287 307 325 4703 4702 echo hi | wc -l & wait 49 167 184 189 237 344 377 374 4752 4751 date | wc -l & wait 50 105 125 129 143 296 318 290 4686 4685 trap 'echo mytrap' EXIT; date & wait 51 168 195 190 238 398 431 381 4754 4753 trap 'echo mytrap' EXIT; date | wc -l & wait 52 112 133 136 153 326 346 318 4698 4697 { trap 'echo mytrap' EXIT; date; } & wait TOTAL 5486 6235 6800 8061 13481 14764 15230 244079 245015