[command]*`alias`* create an alias for a command::
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/alias  [-completion <completion>] <alias> [<command> [<arguments>]]

completion: completion for alias (optional, by default completion is done with target command)
     alias: name of alias (can start or end with "*" for alias listing)
   command: command name (many commands can be separated by semicolons)
 arguments: arguments for command

Without argument, this command lists all defined alias.

Note: in command, special variables are replaced:
        $n: argument 'n' (between 1 and 9)
       $-m: arguments from 1 to 'm'
       $n-: arguments from 'n' to last
      $n-m: arguments from 'n' to 'm'
        $*: all arguments
        $~: last argument
     $nick: current nick
  $channel: current channel
   $server: current server

To remove an alias, use command /unalias.

Examples:
  alias /split to split window horizontally:
    /alias split /window splith
  alias /hello to say "hello" on all channels but not on #weechat:
    /alias hello /allchan -exclude=#weechat msg * hello
  alias /forcejoin to send IRC command "forcejoin" with completion of /sajoin:
    /alias -completion %%sajoin forcejoin /quote forcejoin
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