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difference between "QUIET=${QUIET:-yes}" and "QUIET=yes"

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# 1  
Old 11-11-2009
difference between "QUIET=${QUIET:-yes}" and "QUIET=yes"
Hi,

Can anyone tell me the difference between
Code:
QUIET=${QUIET:-yes}

and 

QUIET=yes

.


Regards,
akash
# 2  
Old 11-11-2009
From the man page:
Code:
${parameter:-word}
          If parameter is set and is non-null then substitute its value; otherwise substitute word.

# 3  
Old 11-11-2009
If the QUIET variable is not set it will be default to yes in the first case

QUIET variable will be set to YES in the second case
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