[irssi] completion in irssi

in irssi, you can define as many completions as you like by simply input command: /completion ty thank you /completion -auto ltns long time for no see so when you input 'ty' and press Tab, then 'ty' will be replaced by 'thank you'. If you use -auto option, then when you input 'ltns', to get the completion, you can press Tab or just press space. Simple and powerful. Try it!