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## compare_shells: bash-4.4 zsh
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# mksh and dash don't support it
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f=_tmp/process-sub.txt
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{ echo 1; echo 2; echo 3; } > $f
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cat <(head -n 2 $f) <(tail -n 2 $f)
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## STDOUT:
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1
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2
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2
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3
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## END
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seq 3 > >(tac)
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## STDOUT:
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3
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2
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1
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## END
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{ echo 1; echo 2; echo 3; } > >(tac)
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## STDOUT:
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3
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2
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1
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## END
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stdout_stderr() {
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echo o1
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echo o2
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sleep 0.1 # Does not change order
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{ echo e1;
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echo warning: e2
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echo e3;
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} >& 2
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}
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stdout_stderr 2> >(grep warning) | tac >$TMP/out.txt
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wait $! # this does nothing in bash 4.3, but probably does in bash 4.4.
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echo OUT
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cat $TMP/out.txt
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# PROBLEM -- OUT comes first, and then 'warning: e2', and then 'o2 o1'. It
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# looks like it's because nobody waits for the proc sub.
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# http://lists.gnu.org/archive/html/help-bash/2017-06/msg00018.html
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## STDOUT:
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OUT
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warning: e2
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o2
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o1
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## END
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echo FOO >foo
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60 |
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# works in bash and zsh
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echo $(<foo)
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# this works in zsh, but not in bash
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tr A-Z a-z < <(<foo)
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cat < <(<foo; echo hi)
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## STDOUT:
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FOO
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hi
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## END
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## OK zsh STDOUT:
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FOO
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foo
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FOO
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hi
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## END
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shopt --set parse_at
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cat <(seq 2; exit 2) <(seq 3; exit 3)
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case $SH in bash*|zsh) exit ;; esac
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echo status @_process_sub_status
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echo done
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## STDOUT:
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1
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2
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1
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2
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3
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status 2 3
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done
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## END
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## N-I bash/zsh STDOUT:
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1
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2
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1
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2
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3
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## END
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case $SH in bash*|zsh) exit ;; esac
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shopt --set parse_at
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cat <(echo a; exit 2) <(echo b; exit 3)
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echo status=$? ps @_process_sub_status
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echo __
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shopt -s process_sub_fail
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cat <(echo a; exit 2) <(echo b; exit 3)
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echo status=$? ps @_process_sub_status
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# Now exit because of it
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set -o errexit
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125 |
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cat <(echo a; exit 2) <(echo b; exit 3)
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echo status=$? ps @_process_sub_status
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## status: 3
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## STDOUT:
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a
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b
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status=0 ps 2 3
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__
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a
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b
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status=3 ps 2 3
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a
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b
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## END
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## N-I bash/zsh status: 0
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## N-I bash/zsh STDOUT:
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## END
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# zsh is very similar to bash, but don't bother with the assertions
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case $SH in bash*|zsh) exit ;; esac
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shopt --set parse_at
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f() {
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cat <(seq 1; exit 1) | {
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cat <(seq 2; exit 2) <(seq 3; exit 3)
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# 2022-11 workaround for race condition: sometimes we get pipeline=141 4
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# instead of pipeline=0 4, which means that the first 'cat' got SIGPIPE.
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# If we make this part of the pipeline take longer, then 'cat' should have
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# a chance to finish.
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sleep 0.01
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(exit 4)
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}
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echo status=$?
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echo process_sub @_process_sub_status
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echo pipeline @_pipeline_status
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echo __
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}
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f
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## STDOUT:
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1
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2
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1
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2
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3
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status=4
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process_sub 2 3
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pipeline 0 4
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__
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## END
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184 |
## N-I bash/zsh STDOUT:
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185 |
## END
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186 |
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188 |
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cat <(seq 3; sleep 0.1) & wait
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190 |
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echo sync
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# This one escapes, and the shell should still exit
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cat <(sleep 0.1) &
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echo fork
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## STDOUT:
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1
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2
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3
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sync
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fork
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## END
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