If you're not yet comfortable with writing scripts on Unix and Linux systems, this post might get you off to a healthy start.

It pays to know these Unix basics considering there is often a Unix/Unix-like OS somewhere in the abstraction hierarchy. If that layer is unsound, the whole edifice risks collapse.

Shell basics The Unix command line shell is roughly equivalent to the command window in Microsoft Windows (cmd or PowerShell).

Although DOS/Windows commands cover the basics, the command set was never as elaborate as Unix. Microsoft later added a more comprehensive command language for Windows (see PowerShell).

Working on the command line is an integral part of being a successful Linux user. You need to have a firm grasp of certain commands to work effectively. There are even certain commands that you must ...

For the beginners in Unix, learning basic Unix commands is a good start. This tip explains basic Unix commands and will move on to the Unix operating system basics and advanced Unix commands.

You need to understanding routing tables if you're going to do any kind of network troubleshooting. Let's take a look at what Linux commands can tell you about how your system is making connections.

The O'Reilly book (Learning Unix for OS X) is decent, but it doesn't really get into OS X-specific things. It doesn't even cover Homebrew. IIRC the only exception is a section on the md* commands ...

How to Change the Owner of a File The easiest way change permissions is through the command line (as GUI options can often be limited or confusing). Let’s take a simple example.