Most people learn the mkdir command on the first day they start using Unix. Along with ls, cd and pwd, it's in the set of the most basic commands that everyone who ventures onto the command line ...

In addition, you can specify a series of subdirectories at multiple levels in the directory tree that you’re setting up. Here’s a very simple example: $ mkdir -p testing/{1,2,3}/{a,b,c} ...

A reader wrote me this week that his bash scripts were complaining “out of memory”; what should he do? It didn’t take long to get him moving again. While my colleague Sandra Henry-Stocker ...