Why do I get integer expression expected error in Bash?

Why do I get integer expression expected error in Bash?

This will result in a script error : integer expression expected because $a contains a non-digit newline character ” “. You have to remove this character using the instructions here: How to remove carriage return from a string in Bash

Where does the integer expression come from in Bash?

If you add more of the script to your question, |I can suggest where this might be coming from. Since used and total are integers and bash does integer arithmetic, though note the shifting of the multiplication be 100 to the beginning. Or if you want to ensure correct rounding (‘integer division’ in computing always effectively rounds down):

Can you use the superior expression in Bash?

In bash and some other shells, you can use the superior [ [ expression as shown in kamituel’s answer. The above will work in any POSIX-compliant shell.

Can you use expr IN a bash script?

Instead of using external commands like wc, expr, cut, you can and should use bash internal string manipulation commands. Also, your script is suited to use bash arithmetic operations.

Do you need a$ inside of the arithmetic expression?

Inside of the arithmetic expression ( (…)) you do not need a $ for expansion and you cannot quote. Thanks for contributing an answer to Unix & Linux Stack Exchange!

Why is 80.0 not an integer in Bash?

You are putting it as 80.0 which is not integer instead it is a floating point. In the last attempt when you used 80 it appears that you have given extra space in the code. I created a sample script and it works fine.

Is there a Bash command that accepts < or >?

(The test / [ command that’s built into the bash shell does accept < and >, but not <= or >=, for strings. But the < or > character has to be quoted to avoid interpretation as an I/O redirection operator.)

Can you use arithmetic operator EQ in Bash?

You have used arithmetic operator -eq which takes the second argument as a number. Naturally, it fails for that reason alone. Note, that this version should work in all shells, as it is defined by POSIX (Portable Operating System Interface). Note, that this version will work in only Bash (Bourne-again shell) and alike.

When to use arithmetic brackets in bash or Ksh?

Incidentally, when doing integer comparisons in bash or ksh, it’s generally recommended to use the ( (..)) arithmetic field, rather than the default test brackets. Assuming again that ” slope ” contains an integer value of course.

What does the string latest.txt mean in Bash?

Second one is called “latest.txt” and contains the latest version. There is 4.2 string in this text file. What it mean is if current.txt is NOT the same with latest.txt then it will say “there is version 4.2 update”. If not, it will say “version 4.1.1 is the latest version”