Plan 9 from Bell Labs’s /usr/web/sources/plan9/sys/src/cmd/unix/drawterm/libmp/reduce

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Distributed under the MIT License.
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O=$1
shift
objtype=$1
shift

ls -p ../$objtype/*.[cs] >[2]/dev/null | sed 's/..$//' > /tmp/reduce.$pid
#
#	if empty directory, just return the input files
#
if (! ~ $status '|') {
	echo $*
	rm /tmp/reduce.$pid
	exit 0
}
echo $* | tr ' ' \012 | grep -v -f /tmp/reduce.$pid | tr \012 ' '
rm /tmp/reduce.$pid

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