Six lesser-known but seriously useful Linux commands

dir doesn't belong on the list, it is not a useful command. It's nice if you don't remember which os you are using, I make that mistake sometimes, but if you do remember then there is no reason to use it, ever.

Not quite a command, but ctrl+r in bash does a real useful history search

On a side note, there is a link on the right with an OpenShift tutorial, which has to have one of the worst UI I've seen lately. It's like they can't fit on a page a documentation, a terminal and a "Next" button, they have to make you scroll 3 different areas of the pages and never display everything at once, on 1080p...

<p><pre><code> column --table</code></pre>