Frankly, this sounds like homework. In addition, it doesn't look like Perl is the best tool for this job - or at least not Perl by itself. In fact, it sounds like you're trying to force the job to fit the tool rather than using the right tool for the job.

Unfortunately, your English isn't quite up to the task of explaining exactly what you want. "i want to extract the value of a variable EXIT(as it will be 0 or other)" - does that mean there's a variable called 'EXIT', or perhaps '$EXIT' in the file, or do you want the exit value of 'grep' - which will be 0 if it finds the line in the file and 1 if it doesn't?

Just for my own amusement, I'm going to define the problem based on my best guesses and give it a shot. Hopefully, this will give you some ideas that you can use to write your own code.

count=$(ls [0-9]*|wc -l)                              # Count filename
+s starting with a number
found=$(grep -c 'para201' [0-9]*|grep -c '1$')        # Count how many
+ of them contain 'para201'
echo $(($found==$count?0:1))                          # Return 0 if th
+e two are the same, 1 otherwise
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