Shell Programming and Scripting

Input Strings file:
File1 content (file1):
" a        "
" a2       "
File2 content (file2):
" a        "
" a        "
" a2       "
" b2       "
" c2       "

while read uid
do
{
 cn=`cat file2 | awk -v k=$uid '$1 ~ k' |wc -l`
        if [ $cn -ge 1 ]
        then
   echo "String and count=$uid  $cn"
       fi
} 
done < file1

$ cat f3
" a        "
" a2       "
$ 
$ cat f4
" a        "
" a        "
" a2       "
" b2       "
" c2       "
$ 
$ grep -f f3 f4
" a        "
" a        "
" a2       "
$

grep -F -f file1 file2

#!/bin/bash
###String matching between files
for i in `cat file1 | awk -F " " '{ print $2 }'`
   do
 for j in `cat file2 | awk -F " " '{ print $2 }'`
   do
     if [ $i = $j ]
        then
        echo " String $i in both the files"
        else
        echo " String $i not in both files"
        fi
   done
done