“The Book of Secret Knowledge” is a collection of awesome lists, manuals, blogs, hacks, one-liners, cli/web tools and more. It is intended for everyone and anyone – especially for System and Network Administrators, DevOps, Pentesters or Security Researchers.
If you’ve ever written a bash script with variables, and know that it wasn’t your last one, I promise you, you’ll love this wiki page. It covers a whole lot of different ways to expand and manipulate variable values in bash, all on a single, conveniently organized page.
The Ultimate Plumber, or up for short, is an excellent interactive tool for anyone who is building complex command sequences for processing text on the Linux command line. If you are a frequent user of grep, sort, cut, awk, sed, and other similar commands, have a look at this demo. I’m sure up will save a tonne of time once you get a hang of it.