Hidden features of Bash


Question

Shell scripts are often used as glue, for automation and simple one-off tasks. What are some of your favorite "hidden" features of the Bash shell/scripting language?

  • One feature per answer
  • Give an example and short description of the feature, not just a link to documentation
  • Label the feature using bold title as the first line

See also:

1
72
5/23/2017 12:17:57 PM

insert preceding line's final parameter

alt-. the most useful key combination ever, try it and see, for some reason no one knows about this one.

press it again and again to select older last parameters.

great when you want to do something else to something you used just a moment ago.

69
9/22/2009 1:49:11 PM

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