this post was submitted on 22 Mar 2024
105 points (88.9% liked)
Linux
48245 readers
512 users here now
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Rules
- Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.
- No misinformation
- No NSFW content
- No hate speech, bigotry, etc
Related Communities
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
founded 5 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
Is there not also a way to disallow empty variables in the script, I think it is
set -u? Then you don't have to keep thinking "should I add a:?here because if empty it may lead to disaster" all the time. Might be even safer.set -euo pipefailat the top of every script makes stuff a lot safer. Explanation here.Yep! I always do this too.
TL;DR:
eaborts the whole script on a non-zero error.uaborts when using an undefined variable.-o pipefailaborts a piped compound command when one of the piped commands fail.Any other way lies madness. Or erasing the whole filesystem apparently!
Yes! But
-uis for undefined variables. It won't stop a defined variable with an empty value. E.gfoo="".Also
?and:?have the advantage of telling you right then and there where the variable use is that it must be defined or not empty... having to trek back to (likely) the top of the script to check is easily forgotten.