git-diff only certain files

[Graham Percival]

Can I get git-diff to only check certain files?  I know I can specify 
them on the command line,

$ git-diff foo/bar baz/boozle

but I'd like to simply point git-diff to a file and have it fill in the 
details for me.  ie something like

$ git-diff < lsr-unsafe.txt


lsr-unsafe.txt  contains:
input/lsr/chords/chord-name-exceptions.ly
input/lsr/expressive/breathing-sign.ly


(I might be missing some basic bash knowledge)

Cheers,
- Graham