One Quickie

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Seeing lines that exist in two files (Unix->General)

Assuming the files are sorted, you can use comm.

Here I'm wondering if any objc files in the current directory also exist in the Classes subdirectory

% ls -1 *.[hm] *.xib | sort > oopack
% cd Classes
% ls -1 *.[hm] *.xib | sort > ../oop2
% cd ..
% comm -12 oopack oop2

The -12 suppresses lines only in file1, and lines only in file2. I'm more interested in their intersection.