ref: 57f8b3d1acf273a88568c49d0b83b6863485b9e0
dir: /sys/src/libsec/port/reduce/
O=$1 shift objtype=$1 shift if(ls -p ../$objtype/*.[cs] >[2]/dev/null | sed 's/..$//;s/^/^/' > /tmp/reduce.$pid) { echo $* | tr ' ' \012 | grep -v -f /tmp/reduce.$pid | tr \012 ' ' } if not { # if empty directory, just return the input files echo $* } rm /tmp/reduce.$pid