Bash if a variable is equal to true

Question

I want to check if the variable is equal to the true keyword and if it is then do something accordingly but it is behaving in an undefined way. don't get what I want its a simple question but thank you : >

STRICT=$false

if [ "$STRICT" == $true ] # i am not sure about this line what should i do
  then  
  FS="${FS} hey"
fi

There are no boolean keywords in shell. $false expands to the value of the (presumably undefined) variable false. — chepner
– chepner, Commented Dec 15, 2021 at 23:14
You might have a misunderstanding about true and false since you're calling it keyword. Consider taking a look at this page about a boolean — 0stone0
– 0stone0, Commented Dec 15, 2021 at 23:15
thanks everyoen i had know idea about that i could use true directly — procoder36
– procoder36, Commented Dec 15, 2021 at 23:15
You can use true directly because it's just a regular string. There is no boolean type in shell, and so no true and false values. — chepner
– chepner, Commented Dec 15, 2021 at 23:16

Barmar · Accepted Answer · 2021-12-15 23:14:38Z

3

Just use strings true and false, not variables.

STRICT=false

if [ "$STRICT" = true ]
then  
  FS="${FS} hey"
fi

And the standard string comparison operator is =. == is a bash extension.

answered Dec 15, 2021 at 23:14

Barmar

789k57 gold badges555 silver badges669 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Bash if a variable is equal to true

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related