cmp --silent $old $new || echo "files are different"

#!/bin/bash

file1=`md5sum $1`
file2=`md5sum $2`

if [ "$file1" = "$file2" ]
then
    echo "Files have the same content"
else
    echo "Files have NOT the same content"
fi

* * * * *  (cmp --silent newfile oldfile || cp -f newfile oldfile && supervisorctl restart app1)

#!/bin/bash

cmp -s filename_1 filename_2 > /dev/null
if [ $? -eq 1 ]; then
    echo is different
else
    echo is not different
fi