Bash unix signals: Difference between revisions
From wikinotes
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# Uninstall a trap | # Uninstall a trap | ||
trap - SIGINT SIGTRAP | trap - SIGINT SIGTRAP | ||
</syntaxhighlight> | |||
You can also trap on any process error (and implement behaviour similar to <code>set -e</code>) | |||
<syntaxhighlight lang="bash"> | |||
on_error() { | |||
echo "There was an error on line $LINENO" | |||
exit 1 | |||
} | |||
trap on_error ERR | |||
</syntaxhighlight> | </syntaxhighlight> | ||
</blockquote><!-- Callback on Signal --> | </blockquote><!-- Callback on Signal --> |
Revision as of 04:35, 27 February 2022
Documentation
man 7 signal
https://man.archlinux.org/man/core/man-pages/signal.7.en wikipedia: unix signals https://en.wikipedia.org/wiki/Signal_(IPC)#POSIX_signals
Send Signal
kill -l # list all signals kill -9 ${PID} # send signal 9 (SIGKILL) kill -SIGINT ${PID} # send isgnal 2 (SIGINT)
Callback on Signal
# Install callback for SIGINT and SIGTRAP on_signal() { echo "received SIGINT or SIGTRAP!" } trap on_signal SIGINT SIGTRAP # Uninstall a trap trap - SIGINT SIGTRAPYou can also trap on any process error (and implement behaviour similar to
set -e
)on_error() { echo "There was an error on line $LINENO" exit 1 } trap on_error ERR