ircsh.sh

#!/bin/sh 
 
nick="tircsh"
channel=testchan
server=irc.freenode.net
config=/tmp/irclog
 
[ -n "$1" ] && channel=$1
[ -n "$2" ] && server=$2
config="${config}_${channel}"
 
echo "NICK $nick" > $config 
echo "USER $nick +i * :$0" >> $config 
echo "JOIN #$channel" >> $config 
 
trap "rm -f $config;exit 0" INT TERM EXIT
 
tail -f $config | nc $server 6667 | while read MESSAGE 
do
  case "$MESSAGE" in
    PING*) echo "PONG${MESSAGE#PING}" >> $config;;
    *QUIT*) ;;
    *PART*) ;;
    *JOIN*) ;;
    *NICK*) ;;
    *PRIVMSG*) echo "${MESSAGE}" | sed -nr "s/^:([^!]+).*PRIVMSG[^:]+:(.*)/[$(date '+%R')] \1> \2/p";;
    *) echo "${MESSAGE}";;
  esac
done