Update cheatsheets

irssi

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# irssi
+
+> Text based IRC client.
+> More information: <https://irssi.org>.
+
+- Open Irssi and connect to a server with a nickname:
+
+`irssi -n {{nickname}} -c {{irc.example.com}}`
+
+- Open Irssi and connect with a specific server on a given port:
+
+`irssi -c {{irc.example.com}} -p {{port}}`
+
+- Display help:
+
+`irssi --help`
+
+- Join a channel:
+
+`/join {{#channelname}}`
+
+- Change active window (starts at 1):
+
+`/win {{window_number}}`
+
+- Exit the application cleanly and quitting any server(s):
+
+`/quit`