Remove Control M (^M) Characters From Unix File

If you see control M characters(^M) in a file in UNIX, don't worry there is a very simple way to convert the file in UNIX format.
The command is

dos2unix filename [newfilename]

e.g. remove control characters from file abc.txt

dos2unix abc.txt abc.txt  #this will replace abc.txt and remove control characters

dos2unix abc.txt xyz.txt  #a new file xyz.txt will be created after removing control characters

So isn't that simple lovely command took off all the worries.