command line send message to IRC

#!/bin/bash

IRC_SERVER='irc.freenode.net'
IRC_PORT=6667
IRC_USERNAME='h4'
IRC_FULLNAME='h4'
IRC_NICK='h4'                                                                                                             
IRC_CHANNEL='#h4'

send_irc_message() {
    message=$1

    echo -e "USER $IRC_USERNAME 8 * : $IRC_FULLNAME\nNICK $IRC_NICK\nJOIN $IRC_CHANNEL\nPRIVMSG :$IRC_CHANNEL $1\nQUIT\n" | nc $IRC_SERVER $IRC_PORT
}

send_irc_message test

References :
ubuntu - Send message to IRC channel from bash - Server Fault
Nunca — Sending messages to an IRC server from a shell script (Bash)

訊息空格問題
sockets - IRC BOT (python) - Stack Overflow