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Assuming you mean in shell scripting:
Quick answer - there is no difference.
So why use one or the other? Using the ${...} version allows you to embed variables within strings, separating the variable from surrounding text.
Bash also allows some string manipulations inside the brackets.
Last edited by astrogeek; 02-01-2014 at 01:31 AM.
Reason: Typos, grammer, too many words...
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declaring variables
