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ubixos / bin / sh / tests / execution / killed2.0
@Charlie Root Charlie Root on 16 Jan 2018 480 bytes BSD Shell
# $FreeBSD: releng/11.1/bin/sh/tests/execution/killed2.0 218105 2011-01-30 22:57:52Z jilles $
# Most shells print a message when a foreground job is killed by a signal.
# POSIX allows this, provided the message is sent to stderr, not stdout.
# Some trickery is needed to capture the message as redirecting stderr of
# the command itself does not affect it. The colon command ensures that
# the subshell forks for ${SH}.

exec 3>&1
r=`(${SH} -c 'kill $$'; :) 2>&1 >&3`
[ -n "$r" ]