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thank you.

:) Thank you! But is it possible for you to explain me how it works ?

exec 5<> /dev/tty

I can understand that you are setting both input and output to /dev/tty. A little explanation will help...

I am stuck with a problem while reading data from a file..

while [ 1 ]
do
read line
#do some operations and if some condition is satisfied, ask the user to...