But a pure Perl solution might be interesting too. (like embedded in the debugger for an interactive shell experience)

update

unfortunately not that easy

• using grep fails because option --exclude is missing
• using diff fails with permission denied problems

Not sure why diff fails for you - works for me; as does grep:

VinsWorldcom@C:\Users\VinsWorldcom> grep --help | grep exclude
      --exclude=PATTERN     files that match PATTERN will be skipped.
      --exclude-from=FILE   files that match PATTERN in FILE will be s
+kipped.

VinsWorldcom@C:\Users\VinsWorldcom> grep --exclude
grep: option `--exclude' requires an argument
Usage: grep [OPTION]... PATTERN [FILE]...
Try `grep --help' for more information.
[download]

$ grep --help|grep exclude

$
[download]

my GIT version is from 2015, but since I have to migrate to a new box I'll update the version anyway :)

update

thanks, installing a fresh version solves the issue! :)

Cheers Rolf
_{(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}