If statement explanation


 
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# 1  
Old 01-23-2013
If statement explanation

Could anyone please advise what the
Quote:
! -z
in the following if statement means?

Code:
if [ ! -z "${RN_FILES}" ] ; then

Thank you.
# 2  
Old 01-23-2013
Here are the list of conditional expressions used with if
# 3  
Old 01-23-2013
Thank you bipinajith, that will help a lot!
 
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