The nifty Perl script latexdiff generates highlighted “diff” differences between two versions of a LaTeX document. This is required in submitting academic paper revisions.
latexdiff in Cygwin by:
setup-x86_64 -P perl texlive-binextra
In regular Linux install
apt install latexdiff
You can then use this script to execute recursively for all .tex files in the directory (useful for very large projects like PhD thesis or journal article).