A few new commands for manipulating text that I never knew about: paste allows one to “paste” two files side by side. First row’s contents of fileB.txt will be to the left of the first row’s contents of fileA.txt, and on down the line. join Imagine mysql or something, this “joins” two (or maybe more) files together on a common field in whitespace-separated lines. It ignores unique values (at least by default) expand I don’t know what I’d ever use this for, but it will convert tabs into spaces.