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On top of what already has been said, please tell us if your operation should be "atomic" or not, i.e. if any name creation fails, should then all 3 names be discarded? Or would it be sort of...

I think you are tackling this from the wrong angle. The first step is to identify what you really want to do:



You might want to change that first. Instead of

command "user1" "user2" "user3"...

Hi,

if it is inside a loop, you can leave it with the break command. You can also just exit the whole script, if there is nothing anymore to do.