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use of parenthesis() in shell programming

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# 1  
Old 06-20-2010
use of parenthesis() in shell programming
What's the use of parenthesis () in shell programming ?
I saw this in one of the posts in this forum :
Code:
echo $($1)

What confounded me was that it evaluated the inner expression and then the outer one, almost like eval. It seemed like it did this in passes.
# 2  
Old 06-20-2010

It is for using the output of one command in another command, frequently to populate a variable:
Code:
output=$( $1 )

The ouput of the command in $1 will be stored in the variable $output.
This User Gave Thanks to cfajohnson For This Post:
daudiam
# 3  
Old 06-20-2010
Thanks a lot !
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