==== diff word by word ====
<code>
git diff --word-diff --no-index -- foo bar
</code>
or
<code>
git diff -U0 --word-diff --no-index -- foo bar
</code>

You can run this command even if the files are not part of a git repository.

Ref:- https://unix.stackexchange.com/a/330807/198064

Related commands:
  * ''<nowiki>git diff --no-index --color-words -- foo bar</nowiki>'' - to diff word by word
  * ''<nowiki>git diff --no-index --color-words=. -- foo bar</nowiki>'' - to diff character by character

==== head and diff ====
To diff headers of two files without creating any temporary files
<code>
% diff <(head -n 1 foo.20170102) <(head -n 1 foo.20170104)
</code>

==== ignore newline endings ====
<code>
diff --strip-trailing-cr file1 file2
</code>