Internet Relay Chat (IRC) is a form of real-time Internet text messaging (chat) or synchronous conferencing. It is mainly designed for group communication in discussion forums, called channels, but also allows one-to-one communication via private message as well as chat and data transfers via Direct Client-to-Client.
IRC client software is available for virtually every computer operating system that supports TCP/IP networking. IRC is based on a line-based structure with the client sending single-line messages to the server, receiving replies to those messages and receiving copies of some messages sent by other clients.
The basic means of communication in an established IRC session is a channel. Channels in a server can be displayed using the IRC command LIST that lists all currently available channels. Channels that are available across an entire IRC network are prepended with a ‘#’, while those local to a server use ‘&’. Other non-standard and less common channel types include ‘+’ channels—’modeless’ channels without operators — and ‘!’ channels, a form of timestamped channel on normally non-timestamped networks.
XChat is a popular Internet Relay Chat (IRC) client. It is available for Unix-like systems, Microsoft Windows (with additional features), Mac OS X (X-Chat Aqua), and for other X Window System-based systems. It has a choice of a tabbed document interface or tree interface, support for multiple servers and is highly configurable. Both command line and graphical versions are available.
XChat is a full-featured IRC client and includes all basic functionalities that are found in most other IRC clients, including CTCP, DCC file transfers and chats, and a plugin system for various languages (including at least C or C++, Perl, Python, Tcl, Ruby, Lua, CLISP, D, and DMDScript). By writing plugins, one can extend the features and customize the functionality of XChat.

Install IRC in ubuntu
Type this at terminal

$ sudo apt-get install xchat

Others please see


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