IRC bot in written in bash

bashbot.sh

#!/usr/bin/env bash

# Open a connection to canternet
exec 3<>/dev/tcp/irc.canternet.org/6667;

# Login and join the channel.
printf "NICK BashBot\r\n" >&3;
printf "USER bashbot 8 * :IRC Bot in Bash\r\n" >&3;
sleep 2;
printf "JOIN #HackingIsMagic\r\n" >&3;

# Main loop
while [ true ]; do
	read msg_in <&3;

	# UGLY ping response.  Sends a PONG whenever PING shows up.
	if  [[ $msg_in =~ "PING" ]] ; then
		printf "PONG %s\n" "${msg_in:5}";
		printf "PONG %s\r\n" "${msg_in:5}" >&3;
	fi

done