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Tag: arithmetic

Q&APosted onAugust 10, 2022

Bitwise shift and the largest integer in Bash

This is an exploration question, meaning I’m not completely sure what this question is about, but I think it’s about the biggest integer in Bash. Anyhow, I’ll define it ostensively.

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Q&APosted onAugust 10, 2022

Check if $REPLY is in a range of numbers

I’m writing a shell script for Linux, using Bash, to translate any video-file into a MP4. For that, I’m using avconv with libvorbis for audio.

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Q&APosted onAugust 10, 2022

What is the rationale for the bash shell not warning you of arithmetic overflow etc.?

There are limits set for the arithmetic evaluation capabilities of the bash shell. The manual is succinct about this aspect of shell arithmetic but states:

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Q&APosted onAugust 9, 2022

Why does a=0; let a++ return exit code 1?

Try it:

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Q&APosted onAugust 9, 2022

Bash: double equals vs -eq

I am doing integer comparison in bash (trying to see if the user is running as root), and I found two different ways of doing it:

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Q&APosted onAugust 9, 2022

How to create a sequence with leading zeroes using brace expansion

When I use the following, I get a result as expected:

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Q&APosted onAugust 8, 2022

bash -e exits when let or expr evaluates to 0

I have a bash script that sets -e so the script will exit on any exit status != 0.

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Q&APosted onAugust 7, 2022

How do I remove leading zeroes from output of ‘date’ or avoid octal interpretation of such decimal numbers?

I have this:

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Q&APosted onAugust 6, 2022

Why does “$(( ~33 ))” produce -34?

NOT x = −x − 1

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