ref: 5ce48f5a822bea79c98a99e697c7a39a24b18f7a
dir: /sys/src/libsec/port/reduce/
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