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Fails as in, grep doesn't find any results.

Then output an error message such as, "User is not logged on"



Er... why not? Is there another command I can use?

I don't want to run things...

I have the following command in a Bash shell script:

who | grep -w $1 | some other commands

If grep fails, an error message is displayed. How do I test if grep fails and still be able to pipe...