ref: babf901b4a508c3ec5d1f89655f10377bbdf9637
dir: /libsec/port/reduce-rc/
O=$1
shift
nonport=$1
shift
ls -p ../$nonport/*.[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