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hpr1903 :: Some further Bash tips

Some more information about types of expansion in Bash

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Hosted by Dave Morriss on Wednesday 2015-11-18 is flagged as Explicit and is released under a CC-BY-SA license.
Tags: Bash,expansion,tilde expansion,command substitution.
Listen in ogg, spx, or mp3 format. | Comments (2)

Part of the series: Bash Scripting

This is an open series in which Hacker Public Radio Listeners can share their Bash scripting knowledge and experience with the community. General programming topics and Bash commands are explored along with some tutorials for the complete novice.

Some further Bash tips


There are seven types of expansion applied to the command line in the following order:

  • Brace expansion (we looked at this subject in the last episode 1884)
  • Tilde expansion
  • Parameter and variable expansion (this was covered in episode 1648)
  • Command substitution
  • Arithmetic expansion
  • Word splitting
  • Pathname expansion

We will look at some more of these in this episode but since there is a lot to cover, we'll continue in a later episode.

I have written out a moderately long set of notes about this subject and these are available here

Show Transcript

Automatically generated using whisper

whisper --model tiny --language en hpr1903.wav


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Comment #1 posted on 2015-11-19T06:56:24Z by Ken Fallon

Another gem

Never knew this was possible.


See what i did there

Comment #2 posted on 2015-11-23T11:28:23Z by Dave Morriss

Thanks Ken

Glad you got something out of this. Bash is surprisingly rich in features considering it's a command-line interpreter.

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