OpBot, un bot IRC en Bash

#!/bin/bash

if test "$1" == ""
then
  CHAN=#OpBot
else
  CHAN=\#$1
fi
echo "Canal à joindre : $CHAN"

exec 3<>/dev/tcp/irc.example.net/6667
echo -e "NICK OpBot" >&3
echo -e "USER OpBot 8 * : Auto-Op Bot" >&3
echo -e "JOIN $CHAN" >&3
echo -e "PRIVMSG $CHAN :Hello world" >&3
sleep 1

while read ligne <&3
do
  join=`echo $ligne | grep "JOIN :$CHAN"`
  if test "$join" != ""
  then
    username=`echo $join | cut -d "!" -f 1`
    username=`echo $username | cut -d ":" -f 2`
    echo "JOIN $username -> op"
    echo -e "PRIVMSG $CHAN :Bienvenue $username" >&3
    echo -e "MODE $CHAN +o $username" >&3
  fi
  ping=`echo $ligne | grep PING`
  if test "$ping" != ""
  then
    echo -n `date`
    echo " - $ping"
    pong=`echo $ligne | cut -d " " -f 2`
    echo -e "PONG $pong" >&3
  fi
  deop=`echo $ligne | grep "MODE $CHAN -o OpBot"`
  if test "$deop" != ""
  then
    echo -e "PRIVMSG $CHAN :Attention, je ne pourrai plus opérer tant que je ne serai pas op." >&3
  fi
done