/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.