alias [alias_name [command [arguments]]]

    create an alias for a command

    alias_name: name of alias
       command: command name (many commands can be separated by semicolons)
     arguments: arguments for command

    Note: in command, special variables $1, $2,..,$9 are replaced by arguments given by user, and $* is replaced by all arguments.
    Variables $nick, $channel and $server are replaced by current nick/channel/server.