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2 things are wrong -
1. You are missing a double quote in your expression (echo $VAR1")
2. Your test expression can't just be the output of the grep command - you need to perform some kind of test...

echo <string> | sed "s/Cluster//"

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

1. You are using a numeric comparision operator (-eq) to compare strings.
2. Why don't you test for inequality instead of equality?
3. You are missing whitespace between your test arguments and...