How to install and configure irssi

irssi is a command-line IRC client.  When properly configured, it can automatically reconnect and re-identify to channels without any user intervention.  It is ideal for use within a reliable server shell, where your session is maintained between uses.

To install Irssi, issue the command for the appropriate system:

Debian or Ubuntu:

 
apt-get install irssi

CentOS or Fedora:

 
yum install irssi

Arch:

 
pacman -S irssi

Mac OS X with MacPorts:

 
port install irssi

Mac OS X with HomeBrew; check for new Brew formulas before you install Irssi. The following commands will update Brew and install Irssi:

 
brew update
brew install irssi

Starting IrssiPermalink

To start Irssi, follow the steps below.

  1. Start a new Screen session called chat so Irssi will keep running when you close your terminal session:

     
    screen -S chat
    
  2. Start Irssi:

     
    irssi
    

    You should see the Irssi startup screen on the default chat interface:

    Irssi's default message.

To rejoin Irssi later, just rejoin your Screen session.

Configuring IrssiPermalink

Now you can start configuring Irssi to use your preferred networks, join channels, and set your nick (nickname). These examples will show you how to connect to the Linode IRC channel, #linode.

Joining IRC NetworksPermalink

The Linode channel is hosted on the OFTC network. An IRC network is made up one or more connected IRC servers with the same channels and people. Linode’s channel is on irc.oftc.net. Join the OFTC network with the following command, from within Irssi:

 
/connect irc.oftc.net

To disconnect from a channel, run:

 
/disconnect irc.oftc.net
Note
You can join additional networks by replacing irc.oftc.net with a different network.

Joining ChannelsPermalink

A channel is a chatroom. Linode’s channel is called #linode. Use the following command to join:

 
/join #linode

Once you’ve joined the channel, you can start typing messages to everyone in the channel.

To join a channel that has a password, use this command, replacing #channel with the channel name, and password with the channel password:

 
/join #channel password

To leave or part an IRC window use the following command:

 
/part #linode

Configuring Default Nickname (Nick)Permalink

To set your default nick use the command, replacing user with your desired nickname:

 
/set nick user

If the nickname (or nick) is already being used on the servers you’re connected to, Irssi will alert you.

Managing IRC NicknamesPermalink

Changing your IRC nickname is easy with the /nick command. Replace user with your new nickname:

 
/nick user

If the nickname (or nick) is already being used on the servers you’re connected to, Irssi will alert you.

When you change nicknames, every channel that you are joined to will receive (and display) a message alerting the participants of those channels that you have changed nicks.

If you want to gather more information about an IRC user, use the command below:

 
/whois new_user

Sample output of the whois command:

 
11:45 -!-  new_user [for@example.com]
11:45 -!-  ircname  : Cecil Sharp
11:45 -!-  channels : #linode
11:45 -!-  server   : sample.oftc.net [Galloway, NJ, US]
11:45 -!-           : user has identified to services

The information provided via this command includes the ircname, channels, and name of the user.

Sending MessagesPermalink

To send a private message to just one person on your network, use the /msg command. You should replace friendnick with the other user’s nick, and Hello there! with your message:

 
/msg friendnick Hello there!
Note
Please note that if you are in a channel, you can use tab to autocomplete nicks within that channel.

Messages are not encrypted and should not be considered secure communications. Also, there is no spellcheck feature in Irssi.

Basic Window NavigationPermalink

Every channel and private message has its own numbered window. To move between windows, use the command:

 
/win number

For example, if you joined the #linode channel on Window 2, you can get back to it with the command:

 
/win 2

Managing and Manipulating WindowsPermalink

Use the Alt key and the window number to change to a different window. Window numbers 1 through 10 are 1 through 0 on the keyboard, and can be accessed by using the keybindings M-1 through M-0. Windows numbered 11 through 19 are accessed by using the key bindings M-q through M-o. Irssi does support more than 19 windows. Windows 20 and up are not accessible by key bindings. Issue the command below to navigate between windows:

 
/win number
Note
If the Alt + num command does not switch windows, use esc followed by the window number.

Below are more commands for navigating between windows:

  • /win list - generates a list in detail of all the windows. Sample output is below.

    Window list output sample.

  • Alt+A (/window goto active) - changes the focus of the current window to the window with the highest amount of activity and the lowest identifier.

  • Ctrl-n (/window next) - moves the current focus to the next window in sequence.

  • Ctrl-p (/window previous) - moves the current focus to the previous window in sequence.

  • /wc (/window close) - closes the currently selected window.

Adding Default NetworksPermalink

To automatically join a network when Irssi starts, run:

 
/server add -auto -network OFTC irc.oftc.net 6667

There are several options in this command. Let’s go over them briefly:

  • The -auto flag tells Irssi to connect to the server on startup.
  • The -network flag associates the server with a specific network. This is useful if you want to add multiple servers on the same network. Here I’ve associated irc.oftc.net with the network name OFTC
  • Next we provide the server address we’re connecting to, irc.oftc.net
  • Finally we specify a port to connect to the server on. You can leave this blank to use the default port, but if there’s an encrypted option we suggest using it.

Note that you may add as many channels as you like.

Irssi Commands and UsagePermalink

All Irssi commands are preceded by a slash (/). Each channel you join as well as any private messages you receive will appear in their own window. A prompt down on the left-hand side will display the name of the active window.

If you expect output from a command but don’t see it, you may need to return to your (status) channel.

Irssi commands are provided in the table below:

Command Description
/ban Sets or lists bans for a channel
/clear Clears a channel buffer
/disconnect Disconnects from the network that has focus
/exit Disconnects your client from all networks and returns to the shell prompt
/join Joins a channel
/kick Kicks a user out
/kickban Kickbans a user
/msg Sends a private message to a user
/names Lists the users in the current channel
/query Opens a query window with a user or closes a current query window
/topic Displays/edits the current topic
/unban Unbans everyone
/whois Displays user information
/window close Forces closure of a window
———————————  

Disconnecting and Exiting IrssiPermalink

Disconnect from an IRC network by using this command, replacing freenode with your network:

 
/disconnect freenode

Exit the Irssi program using the command:

 
/exit

Configuring HilightsPermalink

The hilight command will highlight certain words used in the channels you have joined. If there are particular words or topics that you want to keep track of, add them with this command :

 
/hilight word

To remove a hilight, use the command:

 
/dehilight word

 

 

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