September 2018
Beginner
186 pages
4h 30m
English
Content preview from Bash Quick Start Guide
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Changing case
You can have a variable expand into its value with all characters uppercase or lowercase using the "${myvar^^}" and "${myvar,,}" forms, respectively:
bash$ fn='mixedCase'
bash$ printf '%s\n' "${fn^^}"
MIXEDCASE
bash$ printf '%s\n' "${fn,,}"
mixedcase
Can you guess what the form with a single ^ or , might do, rather than a double one? Try it out.
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.