ref: d56e82d34b02a0aea4076e27b7290a544b98bb9a
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