I need to grep for specific comments from a cvs file and give an output based on that in a python file.
For example, if there is a comment saying "deleted" then i need a command which outputs the comment so that I can assign that output to a variable and do an re.search on the contents of that variable in my python file.
I'll assume that by "comment", you mean the log message provided with cvs commit.
Given just a *,v file, you can use the rlog command (part of rcs, not part of cvs) to get a log that will show all the commit messages.
But ordinarily it should be part of a CVS repository; in that case, cvs log will do the same thing.
Both rlog and cvs log produce very similar plain-text output that should be reasonably easy to parse.
That's about all I can come up with based on the information you've given us. Provide a more detailed question, and we can probably give you a more detailed answer.
UPDATE :
If by "comments" you mean text in the files themselves rather than commit messages, you can extract individual versions of the file using a command like this:
cvs update -p -r1.23 filename
The -p option tells cvs update to print the contents of the file to stdout.
Shameless self-promotion: My own get-versions tool lets you grab multiple versions of a file in a single command (it currently works with RCS, CVS, and Git).
Extracting a particular comment and storing it in a variable will require more work and, as I said, a more detailed question.
