Solving "/bin/bash^M: bad interpreter: No such file or directory"

If you are getting errors like "/bin/bash^M: bad interpreter: No such file or directory", then I am a mind-reader and can say that you have edited this script on a Windows system. Error looks like:

# ./mysql_backup.sh
-bash: ./mysql_backup.sh: /bin/bash^M: bad interpreter: No such file or directory

You can solve this error by using "dos2unix" as:

# dos2unix mysql_backup.sh