How to check the variable is empty with spacing


 
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# 1  
Old 02-01-2010
How to check the variable is empty with spacing

How to check the variable is empty or not?

aaa=" "

how to check aaa variable is empty or just spacing?
If only spacing inside.. it will asume it is empty.
some are 6 spacing, or 8 spacing.. as long as variable is empty with spacing..

anyone can help me?
# 2  
Old 02-01-2010
From man test
Quote:
-z string
True if the length of string string is zero.
# 3  
Old 02-01-2010
Code:
[ -z $var ]

Oops! I was bit late.
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