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The Book of PF: A No-Nonsense Guide to the OpenBSD Firewall

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Linux : Basics About Unix-like OS
Linux referred to the usually free, unix-like Operating systems based on the Linux kernel and is GNU GPL based software. The large, commercial distribution was from 1992 through the licensing of the Linux kernel under the free GNU GPL. In 1983, Richard Stallman launched the GNU project with the goal to develop an Unix-like, POSIX -compatible operating system.