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Windows XP is a line of operating systems developed by Microsoft for use on general-purpose computer systems, including home and business desktops, no...

Ubuntu is an operating system for desktops, laptops and servers. It is a Linux distribution that is based on Debian GNU/Linux. Ubuntu aims to provide...

Debian is a computer operating system composed entirely of free software. Its primary form, Debian GNU/Linux, is a popular and influential Linux distr...

The Z shell (zsh) is a Unix shell that can be used as an interactive login shell and as a powerful command interpreter for shell scripting. Zsh can be...

Tcsh is an enhanced but completely compatible version of the Berkeley UNIX C shell. It is a command language interpreter usable both as an interactive...

Mac OS X v10.5 "Leopard" was released on October 26, 2007. It was called by Apple "the largest update of Mac OS X". It brought more than 300 new featu...