Would a --field option to frm be generally useful?

[Sam Roberts]

A few things in this diff:

1 - I changed it to only print subject if get_header(SUBJECT)
    returned success, otherwise I assume it would print the stack.

2 - I corrected a tiny typo in the usage message.

3 - And I added an option -f,--field that prints the named field
    in the mailbox, and nothing else. Don't know if that's generally
    useful, or if the API of frm is supposed to be some particular
    way to be compatible with some other frm.

Also, it wouls seem to me that I should be able to provide a url
as the mailbox, but neither file://home/sam/Mail/Sent nor
file:///home/sam/Mail/Sent seemed to work for me. I didn't have
time to look for why, yet. Should they work?

Sam

-- 
Sam Roberts <address@hidden> (http://www.emyr.net/Sam)

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