From: Frederick Lee <frederick.c.lee@...>
Date: 2010-09-09T02:59:12+09:00
Subject: Automatic Diff -q Between Two Directories

Greetings:
   I've been toying with ruby off/on in years.   Now I've come across a
practical application that ruby may be of use to me.

Scenario:  Two directories with many files in parallel: differences is
content, names are same.

I need to check which files have been modified.
That is, automating the $diff -q command thusly:

[/Users/admin/workarea]diff -q file1.txt file2.txt >> result.txt
[/Users/admin/workarea]diff -q file3.txt file4.txt >> result.txt
...

[/Users/admin/workarea]more result.txt
Files file1.txt and file2.txt differ
Files file3.txt and file4.txt differ
...

So imaging the scenario:
/src1
  /src1/file1.txt
  /src1/file2.txt
  ...

vs.

/src2
  /src2/file1.txt
  /src2/file2.txt
  ...

So essentially there's a loop through one directory vs a parallel
directory.
Is there  simple example how I could do this in (interactive/irb) Ruby?

Regards,
Ric.
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