What does the -z expression stand for?


 
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# 8  
Old 07-23-2013
If it says it's not assigned, I'm inclined to believe it. Something else is going on.

Perhaps there's a minor error or typo in the variable name which means the wrong one is being set or the wrong one is being tested. Remember that variable names are case-sensitive.
# 9  
Old 07-23-2013
$ARBORDBU can be environment variable (process environment) or a shell variable.
Code:
export ARBORDBU

links the shell variable to the environment, substituting a prior ARBORDBU.
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