Plan 9 from Bell Labs’s /usr/web/sources/patch/ape-erik/reduce.orig

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

cwd=`{basename -d `{pwd}}
cwd=$cwd/$objtype
bind -ac /sys/src/libsec/$objtype $cwd

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
	unmount $cwd
	exit 0
}
echo $* | tr ' ' \012 | grep -v -f /tmp/reduce.$pid | tr \012 ' '
rm /tmp/reduce.$pid
unmount $cwd

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