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I've got a script at the moment that looks like this:

if [ $submenunum -eq 6 ]
then
echo "How many hours would you like users to have logged in for? (single digits)"
...

How do I find this out? I have a feeling its a simple command such as who, but I just don't know what it is. I've had a search on here but either I can't put it into the right search criteria or...