hey manas,

I didn't understand why the while loop is required?

I tried the following way. It isn't giving any error but no outputs also

x=`nawk -F 'NR == 1 {print $1}' | sed 's/^.*(\(.*\))/\1/'`
echo "$x"

The nawk part is working. I have checked it with echo command. So the input to sed is something like name(abc).

Can you please clarify where I am going wrong?