nc.zsh

#!/bin/zsh

zmodload zsh/net/tcp

if [[ $# -ne 2 ]] || [[ $1 == '-l' ]]; then
  echo "$0 <host> <port>:" >&2
  echo "    Sends stdin to <host>:<port>" >&2
  exit 1
fi

ztcp $1 $2
fd=$REPLY
if [[ -z $fd ]]; then
  exit 2
fi

cat <&$fd &
CAT_PID=$!
trap "kill $CAT_PID" SIGINT

trap "kill $$" SIGCHLD
# There is a bit of a race here, but YOLO.
cat >&$fd

ztcp -c $fd