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Could anyone please help me out with understanding what thhe following bit does:

A = ${B}.{C}.$$

and later on in the script

java abc ${A}

WHat does A equal to?

Thanks so much
V

Could someone please tell me what {} mean when they surround a variable?

For instance,

$FILE = 'basename $1' //what is passed into this script
$BANK = 'dirname $1'
$INFILE =...