Bash script produces error using if condition

Question

I have a problem with if in bash script. I've written the following if condition but it produces an error:

if [[ "$capacity" != *10 && "$capacity" != *20  ]] || [[ "$capacity" != *80 && "$capacity" != *100 ]]; then

Simply, I want to compare (two values not equals to) || (two values not equals to) condition using or operator

it checks if $capacity ends with .10 , it works if I write only the first section like this -> if [[ "$capacity" != *10 && "$capacity" != *20 ]]; then — jore
– jore, Commented Jan 30, 2018 at 23:09
/bin/sh is not bash. They're different shells implementing different languages. (Even when /bin/sh is a link to the bash executable, it runs in POSIX compatibility mode when run under that name). — Charles Duffy
– Charles Duffy, Commented Jan 30, 2018 at 23:18
You know that condition is a tautology (always true), right? — Kevin
– Kevin, Commented Jan 30, 2018 at 23:47

that other guy · Accepted Answer · 2018-01-30 23:15:27Z

1

I took your line and added enough additional lines to make it a Minimal, Complete, and Verifiable example:

#!/bin/bash
capacity=55

if [[ "$capacity" != *10 && "$capacity" != *20  ]] || [[ "$capacity" != *80 && "$capacity" != *100 ]]; then
  echo "match"
fi

Then I ran it like this:

$ chmod +x ./myscript
$ ./myscript
match

It wrote "match", exactly as I expected.

Will you please do the same thing?

Add enough lines so that I can run your code on my machine
Show how you run it and what it outputs
Explain why this is different from what you expected

answered Jan 30, 2018 at 23:15

that other guy

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4 Comments

jore Over a year ago

I saved it as script.sh and then I run it as ./script.sh

that other guy Over a year ago

@jore The example you posted has no fi so this is indeed an error. You need a body for your if statement and a fi to terminate it

jore Over a year ago

I pasted here only the part of my code without fi, i have it

that other guy Over a year ago

@jore StackOverflow expects you to write a complete question that contains all the details needed to answer it. You have asked an incomplete question that is missing important information. Please improve your question. Click "edit" and add the missing information.

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