But I recommend getting something like bsd, linux, cygwin (bash for Windows), &c, & learn.

bash shell (a wikipedia page about it. But there are of course other shells.)
The "diff" command (wikipedia page. You can also search for the "manual page" or "man page". All software people should probably be able to do this.).
cygwin (unix-like utilities, *very* useful, on Windows. There are probably other useful ways to do it also, but none as free/open as the above links)
For more trust & control, & so bugs can always be fixed, consider GNU/Linux (www.debian.org, Free & open. See their fine documentation.)
Devuan (pronounced "dev-one"): a debian derivative with added advantage of working without "systemd". The debian.org documentation and alerts are still useful.
Or, OpenBSD (better security): Free/open general-purpose operating system, with only *2* remote security vulnerabilies in the default setup since 1996! !
Does your computer make you feel like...someone else is the boss? Get good support AND *local trust & control* (unlike with proprietary vendors)!

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