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What are $(...) and $((...)) used for?

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Top Forums Shell Programming and Scripting What are $(...) and $((...)) used for?
# 1  
Old 12-04-2010
What are $(...) and $((...)) used for?
I'm starting with shell programming, but I can't find what are $(...) and $((...)) used for...

Whats the difference between them???

Can someone help me??

Thanks!
# 2  
Old 12-04-2010
$(...)evaluate the command that is inside and pass the result as a variable (new fashion) ... the old fashion way is using back tick ``
$((...))is used when evaluating arithmetic operation
This User Gave Thanks to ctsgnb For This Post:
Sandia_man
# 3  
Old 12-04-2010
Thank you!!
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