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From: | Pádraig Brady |
Subject: | bug#34488: Add sort --limit, or document workarounds for sort|head error messages |
Date: | Sun, 17 Feb 2019 18:20:19 -0800 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 |
On 15/02/19 07:20, Eric Blake wrote: > Except that POSIX has the nasty requirement that sh started with an > inherited ignored SIGPIPE must silently ignore all attempts from within > the shell to restore SIGPIPE handling to child processes of the shell: > > $ (trap '' PIPE; bash -c 'trap - PIPE; \ > seq 9999 | sort -n | sed 5q | wc -l') > 5 > sort: write failed: 'standard output': Broken pipe > sort: write error > You HAVE to use some other intermediate program if you want to override > an inherited ignored SIGPIPE in sh into an inherited default-behavior > SIGPIPE in sort. Should we also propose to POSIX to allow trap to specify default? Maybe `trap 0 PIPE` or similar?
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