Top Ten One-Liners from CommandLineFu Explained

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April 05, 2010, 13:14

I accidentally left this comment under the wrong article :). Posting it here too, (sorry Peteris, I'd delete the other one if I could).

Reading this post, I realized you could use the set expansion stuff for a rudimentary calculator. I'm not arguing this is a _good_ tool, it just works, for natural numbers.

For instance, 3*5
$ echo {1,2,3}{1,2,3,4,5} | wc -w
15

Also, here's a way you can print every number from 1 to 99 (I won't print the output, you can try it on your own).

$ echo {,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}

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