find print only uppercase words from a file

I need a script  that will extract from a file only those words in uppercase, and print only the uppercase words
example: print only those words from a Makefile that are all in uppercase
reason for script: uppercase words are typically macros in a Makefile. I wrote a one liner that will expand the macro, but am having difficulty just extracting the macros from the Makefile.

I will be using this in a Linux/Unix environment

Thanks.
laughtrax4Asked:
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DocGyverCommented:
well the following egrep will get all lines that have "words" of at least 2 all uppercase characters

egrep  '\W[A-Z]{2,}\W|^[A-Z]{2,}\W|\W[A-Z]{2,}$'

once you have that it should be a fairly simple 'sed' command to give you only the matching part.  Can you handle the sed?

Doc..
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veedarCommented:
This deletes all lower case, punctuation and digits....leaving just uppercase...

cat file | tr -d [:lower:][:punct:][:digit:]

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TintinCommented:
grep -o -w '[A-Z]*' /some/file
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