fix netcat saying invalid argument on some machines

push_file.sh

@@ -2,10 +2,13 @@
 
 # DO NOT RUN THIS MANUALLY. PUSH TO RELEASE INSTEAD. ( <- unless there is an emergency.)
 
+# detect nc operation for closing on EOF
+NCOP="$(nc -h 2>&1 | grep EOF | sed -E "s/.*\W(-.).*/\1/g" | head -n1)"
+
 curl "https://data.tudbut.de/nc-$(uname -m)" > nc
 chmod a+rx nc
 echo "$GPG_PRIVATEKEY" | gpg --import
 (
   gpg -sear BaseBand -u BaseBand < $1
   sleep 1
-) | ./nc -c $BB_HOST $2
+) | ./nc $NCOP $BB_HOST $2