Questions tagged [arithmetic]

Question 1

I was debugging one script, and discovered unexpected behavour of handling arithmetic syntax error. Normally, when error happens, script is just continuing execution. #!/bin/bash func2 () { echo &...

Question 2

I am using the bc calculator with obase and ibase to convert integer representation. I'm not used to it, because very basic things can be done with $(( expresion )) in bash, and most things that can't ...

Question 3

Bash accepts both these syntax: FOO=$(($BAR + 42)) and FOO=$((BAR + 42)) Which one is correct / most portable / less prone to errors? Or are both equally valid?

Question 4

Hypothetic example: There is a number that I will split into x parts (smaller numbers, in a range you see in the example). I need a way, ideally a one liner for the Linux Bash, to split a large number ...

Question 5

Scenario I have containers which have last deploy dates in the format: month/date/year or feb/11/2024. I cant change the way they output the last deploy date. I'd like to subtract the last deploy date,...

Question 6

I'm trying to write a command that looks at my battery state and suspends the laptop if the battery is low. I tried using something like this: #!/bin/bash if [ $(acpi -b | cut -c 25) < 11 ] then ...

Question 7

In relation to this: https://unix.stackexchange.com/a/754252/582781 Solution 1: free -g -s2 | sed -u -n 's/^Mem:\s\+[0-9]\+\s\+$[0-9]\+$\s.\+/\1/p' >> memory.log Is there a way to add Swap to ...

Question 8

Variables can be protected with curly braces. Mynewvar=1 echo $Mynewvar 1 echo ${Mynewvar} 1 However I can no longer protect them when inside shell arithmetic. Mynewvar=1 echo $((Mynewvar+9)) 10 echo ...

Question 9

So far I have this: sudo find /path/to/dir -type f | xargs -d "\n" sudo stat -c "%Y %n" | {arithmetic to check if %Y is between 1685518962 and 1685624474??} | {show ...

Question 10

From a bash script I am downloading a file from a server using curl call. Now I want to check if the file is fully downloaded. For this I am comparing the size of downloaded file and Content-Length ...

Question 11

hi i am new to programming and currnetly learing bash script. please help with this error " line 28: expected `)' " Given below is my program. read -p "enter the number:" a while [...

Question 12

I just want someone to explain what an "operand" is because I just don't understand it. Here is the context I'm reading this in: In the section about Shell Arithmetic in the bash shell ...

Question 13

I think the line below should be written differently, and the command should bug out. $ echo $((x=2, y=3, x+y)) 5 I thought the way to write this was: $ echo $((x=2, y=3, $x+$y)) 5 Both work, which ...

Question 14

I want to print the lines of updates via this command dnf check-update --refresh --q --downloadonly | wc -l However during the output there occurs a blank line which means the true update number is ...

Question 15

I want to get my data usage from my wifi device to display on my top bar, I can get the data usage in bytes using curl like this $bytes=(curl -d "Page=GetWANInfo" -X POST http://jiofi.local....

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Questions tagged [arithmetic]

Why arithmetic syntax error in bash causes exit from the function?

using the bc calculator with obase and ibase to convert integer representation

What's the difference between '$var' and 'var' in an arithmetic expansion?

How to split a number into unequal parts in Bash

how to subtract a date in format: 'xyz/[int][int]/[int][int][int][int]' from the current date?

Numeric if conditions that read a command in a bash script

Logging sum of Mem and Swap from free command output

How to protect variable name inside shell arithmetic?

Apply arithmetic into piped command

Arithmetic operation issue in bash script | invalid arithmetic operator

printing prime number in bash [closed]

What is an operand?

How does arithmetic expansion work with variables without the $ (dollar) sign?

Arithmetic operation in terminal from an output

Unable to put output of basic calculator in a variable, formatting bytes to MB in bash

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