the Linux Operating System
it's uses in the systems, networking & security administration field

Linux is the brainchild of Linus Torvalds, who in 1992, when a student in Finland, created a "public - shareable" Unix kernel.  In the past 15 years or so the kernel, it's surrounding utilities & associated programs, to say nothing of a number of companies put together to package & market this system, have grown exponentially in use & popularity.  As of approximately Q2 2015 there are estimated to be about 23 million Linux computers running, supporting both desktop use (primarily for Unix & other "hobbysts") as well as for server environments for services such as:

In my  Linux  experiences I have had Linux loaded on & running & using on a daily basis (this is JUST the OLDER versions, I'm now (mostly) using Ubuntu and Debian:

Here's a file I wrote in 1998 after my first Linux-Laptop experience: ToshibaLinux98

Here's a file of similar thoughts in March1999: NECLinux99 (later updated in August 1999)

Here's some thoughts on Linux as a desktop and/or LAN-Services machine: LinuxServer (later)

last updated:   06:36 a.m.  on Wednesday, 13 May, 2015   revID: 7r;  (Mac OS "X" 10.10.3)  <file originally created: 06Mar99>