What are Unix and Linux? And how do I tell which I'm using?
46699
What is the difference between Unix, Linux, BSD and GNU?
7314
What is the exact difference between a 'terminal', a 'shell', a 'tty' and a 'console'?
143891
How can I find out what version of Debian a particular version of Ubuntu is based on?
99668
How can I tell what version of Linux I'm using?
17849
Which shell am I running on?
93027
How to know the types of windowing system, window manager and desktop environment of a Unix-like OS
112632
How can I find the source code for linux commands?
137801
How can I find the current OS in Python?
72215
What are the fundamental differences between the mainstream *NIX shells?
108853
How to determine the "age" of a linux system since installation?
85261
How do I find out which paths my (La)TeX installation checks looking for packages (on a Linux system)?
31991
Terminal vs bash?
77976
How do I know if I am running 32 or 64-bit Linux?
111773
How to check OS and version using a Linux command
143702
What's the difference between /usr/lib/systemd/system and /etc/systemd/system?
44589
What does "Ubuntu" mean?
40402
How do I go about tracking down IO usage in Linux and other *nix OS'?