"If variable does not contain" not working

Question

This is my script

if [[ ! $url == *.txt ]]
then
exit
fi

I have also tried:

if [[ ! "$url" == *.txt ]]
then
exit
fi

and:

if [[ "$url" !== *.txt ]]
then
exit
fi

But even though $url does contain *.txt it still exits?

Solution 1

The correct operator for inequality is !=. See below:

url=/heads/paths/lol.txt
if [[ $url != *.txt ]] ; then echo "does not contain txt"; else echo "contains txt"; fi

It gives:

contains txt

ref: http://tldp.org/LDP/abs/html/comparison-ops.html

Solution 2

You should do this:

[ -n "${url%%*.txt}" ] && 
echo "\$url is not null and does not end with the string '.txt'"

Comments

[Ketan Maheshwari]

What is the exact value of $url?

[DisplayName]

Its different every time but something like /heads/paths/lol.txt.

[Stéphane Chazelas]

What's the output of LC_ALL=C printf "%q\n" "$url"? Does running your script with bash -x confirm that it is exiting at that point?