cmp:
  finds the first difference

comm
  What is it?

diff/patch
https://git-scm.com/docs/git-difftool

icdiff:
http://www.jefftk.com/icdiff
https://github.com/jeffkaufman/icdiff
/usr/share/doc/icdiff/README.md

## Using with git
http://stackoverflow.com/questions/6412516/configuring-diff-tool-with-gitconfig

To install this as a tool you can use with git, copy
git-icdiff onto your path and run:
git icdiff

git difftool --extcmd icdiff