Removing ^M in text files under Linux

As per this ASCII table the carriage return or the character ^M is listed as:

CR ^M 13 0D carriage return

^M can either be expressed in decimal or base 10 (n₁₀) as: 13;
in hexadecimal or base 16 (n₁₆) as: 0D;
or in octal or base 8 (n₈) as: 015.

The conversion: 015₈ = 0₈ 1₈ 5₈ = 0x8² + 1x8¹ + 5x8⁰ = 0 + 8 + 5 = 13₁₀

Here's a neat little tip for mass removal of the annoying presence of ^M in text files that were edited on a Windows computer in Linux using Perl:

perl -pi -e "s/\015//g" index.html

or even better:

perl -pi -e "s/\015//g" folder/*.*

removes it completely from all text files in the folder.