Shell Programming and Scripting

((wc -l a1)/(wc -l a1 + wc -l b1))*100

#!/bin/bash

# Feeds lines into wc -l as arguments.  A file containing lines 'a', 'b', 'c' would
# run wc -l a b c to count lines for all those files.
xargs wc -l < listofa > linesa
xargs wc -l < listofb > linesb

while read LINEA FILEA
do
        [ "$FILEA" = "total" ] && continue # Skip 'total' lines

        while read LINEB FILEB
        do
                [ "$FILEB" = "total" ] && continue # Skip 'total' lines

                echo $FILEA $FILEB $(( (LINESA*100) / (LINESA+LINESB) ))
        done <linesb
done <linesa

rm -f linesa linesb

file1
file2
file3

file11
file22
file33

file1 file11
file2 file22
file3 file33