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hint
Why are you reading username when you are overiding that later with $1


advice
along with the question, put how did you execute the command, what output did you get like
...

You should use them when you want to pass the output of what is within the quotes to another command, or a variable assignment.

e.g. if you wanted to assign the content of the user's passwd entry...

You need to remove the backticks as well:


if grep $username /etc/passwd > /dev/null

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