As I read in Wikipedia, Unix started as a revolutionary operating system written mostly in C allowing it to be ported and used on different hardware. Descendants of Unix is mentioned next, mostly BSD. Clones of Unix, Minix/Linux are discussed as well.
Can you explain the evolution hierarchy of operating systems (Linux and Windows) from Unix?
I’ve noticed that throughout the Internet, within forums and blog posts, Unix always has a * in the word, whether it is *nix or Un*x, as I noticed at the welcoming banner at the Unix StackExchange site.
How can you log every command someone has entered into the shell?
More and more tar archives use the xz format based on LZMA2 for compression instead of the traditional bzip2(bz2) compression. In fact kernel.org made a late “Good-bye bzip2” announcement, 27th Dec. 2013, indicating kernel sources would from this point on be released in both tar.gz and tar.xz format – and on the main page of the website what’s directly offered is in tar.xz.
The wheel group on *nix computers typically refers to the group with some sort of root-like access. I’ve heard that on some *nixes it’s the group of users with the right to run su, but on Linux that seems to be anyone (although you need the root password, naturally). On Linux distributions I’ve used it seems to be the group that by default has the right to use sudo; there’s an entry in sudoers for them:
From the post Why can rm remove read-only files? I understand that rm just needs write permission on directory to remove the file. But I find it hard to digest the behaviour where we can easily delete a file who owner and group different.
So there’s chown which lets you change the owner and group of files and/or directories. But there’s also chgrp which only changes the group. Why was chgrp created? Isn’t it redundant?
I understand what GNU Info is and how to use it, but what is it for? Why does it exist in parallel to the man pages? Why not write detailed man pages rather than provide a separate utility?
Is it “resource configuration”, by any chance?