simpleSocket.sh

#!/bin/bash
PORT=1234
APPEND="Ganagato"
if [[  "$1" = "listener" ]]; then
  counter=0
  while read line; do
    echo "${line}${APPEND}${counter}"
    counter=$((counter+1))
  done < "${2:-/dev/stdin}"
elif [[ "$1" = "-h" ]]; then
  echo "simple eco socket"
  echo "to launch the socket, only launch the script whit no arguments"
  echo "to conect to the socket you can use the next example"
  echo "usage: nc localhost $PORT"
else
 rm -f /tmp/f; mkfifo /tmp/f
 cmd="cat /tmp/f | $0 listener 2>&1 | nc -l 127.0.0.1 $PORT > /tmp/f"
 echo "Simple eco socket listening in port: $PORT"
 echo "to leave use CTRL+C or kill $$"
 while true; do 
   eval $cmd
   echo "Re-spawning the socket"
 done
fi