UNIX for Beginners Questions & Answers

$diff -y abc.txt bcd.txt  -- compared the files side by side

#! /bin/sh
# rt.sh

if [[ $# -ne 2 ]] ; then
echo "Need just 2 files to compare"
exit 1
fi ;

# Take the diff by ignoring the blank and whitespaces.
diff -b -w ${1} ${2} > ${1}.diff
        if [[ $? -eq 0 ]] ; then
        echo "No files were added/removed"
        else
        echo "Files were added/removed"
        fi ;

# Process the diff file.
# A line might look like 
# < text-which-went-out
# > text-which-came-in

while read line
do
        if [[ ${line:0:2} == "< " ]] ; then
        echo ${line:2} is removed. 
        fi ;

        if [[ ${line:0:2} == "> " ]] ; then
        echo ${line:2} is added.  
        fi ;

done < ${1}.diff

rm ${1}.diff

grep -vf file1.txt  file2.txt