Date: Tue, 12 Dec 2017 11:48:20 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 224270] Get exit status of process that's piped to another: set -o pipefail is missing for /bin/sh Message-ID: <bug-224270-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D224270 Bug ID: 224270 Summary: Get exit status of process that's piped to another: set -o pipefail is missing for /bin/sh Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: bin Assignee: freebsd-bugs@FreeBSD.org Reporter: wosch@FreeBSD.org The bash, zsh and ksh have a nice feature to detect a non-zero status in a pipe: from the bash(1) manual page: The return status of a pipeline is the exit status of the last comm= and, unless the pipefail option is enabled. If pipefail is enabled, the pipelin= e's=20 return status is the value of the last (rightmost) command to exit with= a non-zero status, or zero if all commands exit successfully.=20 $ bash -c 'set -o pipefail; false | true; echo $?' 1 $ ksh93 -c 'set -o pipefail; false | true; echo $?' 1 $ zsh -c 'set -o pipefail; false | true; echo $?' 1 However, this feature is missing in /bin/sh: $ sh -c 'set -o pipefail; false | true; echo $?' set: Illegal option -o pipefail $ sh -c 'false | true; echo $?' 0 There are workaround for shell which don=E2=80=99t check the pipe status, a= s described in https://unix.stackexchange.com/questions/14270/get-exit-status-of-process-t= hats-piped-to-another (((((exec 3>&- 4>&-; someprog); echo $? >&3) | filter >&4) 3>&1) | (read xs; exit $xs)) 4>&1 but this looks bizarre and you have to do it for every command in the pipe line. I really wish that we have the 'set -o pipefail' option setting in FreeBSD /bin/sh too. --=20 You are receiving this mail because: You are the assignee for the bug.=
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