For anyone looking, there have been several great HN threads about UNIX commands, here are just a few:<p><a href="https://news.ycombinator.com/item?id=6360320" rel="nofollow">https://news.ycombinator.com/item?id=6360320</a><p><a href="https://news.ycombinator.com/item?id=6046682" rel="nofollow">https://news.ycombinator.com/item?id=6046682</a><p><a href="https://news.ycombinator.com/item?id=5022457" rel="nofollow">https://news.ycombinator.com/item?id=5022457</a><p><a href="https://news.ycombinator.com/item?id=4985393" rel="nofollow">https://news.ycombinator.com/item?id=4985393</a><p>I have also created a couple screencasts about the "Filesystem Hierarchy Standard" @ <a href="http://sysadmincasts.com/episodes/12-crash-course-on-the-filesystem-hierarchy-standard" rel="nofollow">http://sysadmincasts.com/episodes/12-crash-course-on-the-fil...</a> and a "Crash Course on Common Commands" @ <a href="http://sysadmincasts.com/episodes/13-crash-course-on-common-commands" rel="nofollow">http://sysadmincasts.com/episodes/13-crash-course-on-common-...</a>