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i used perl to solve the problem i had. thanks.

#!/usr/bin/perl
$n = `egrep -n "string" filename | egrep -o "[[:digit:]]{1,}" | sed q`;
$m = `egrep -n "string" filename | egrep -o...

I am using egrep to extract numbers from a file and storing them as variables in a script. But I am not able to do any arithmetic operations on the variables using "expr" because it stores them as...