{} and ( ) differences

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# 1  
Old 06-30-2011
{} and ( ) differences

Can u tell the diff between the
1) $a and ${a}
2)[[ ]] and ( )
3)" " and ' ' , ` `
4) 'a' , "a", please explain with simple example
# 2  
Old 06-30-2011
This looks like homework. Please post homework questions in the homework forum.
This User Gave Thanks to jim mcnamara For This Post:
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