Beginning Linux Programming
by Matthew Stones
Wrox Press | September 27, 1999 | Trade Paperback
The Linux operating system, an open-source UNIX-like OS, was developed in 1991 for PCs. Without the Internet, its development and adoption wouldn't have occurred. At its core, it consists of the Linux kernel, a flotilla of free GNU tools and the X Window system.
Its adoption and development in the intervening time has been impressive -- estimates of Linux users vary from 4 to 10 million in March 1998, and the growth to that point was exponential. That puts the current user base somewhere around 14 million (see http: //www.redhat.com/knowledgebase/linuxmarket.html for more information).