Linux Security is starting a series of Linux security (surprise surprise) tutorials, and the first one covers managing Linux file permissions. Reading and changing permissions are both covered, and it’s assumed you understand what read/write/execute mean and their effects on files.

The accompanying video is all from the narrator’s terminal, making it easy for viewers to follow and understand what’s happening. If you know what the output of ls -al means and what chmod 755 file does, then this tutorial isn’t for you; it’s just a primer for new users and those who haven’t managed permissions from the command line.

I do like how this was done, though, and I look forward to their future tutorials. It’ll be nice, too, if they get more indepth with other aspects of Linux security such as securing Apache or administering Tripwire.