Way to print fingerprint of a key in your known_hosts file?

Hello there,

The subject line says it all, really.  How can I take a line from my 
known-hosts file, and print the fingerprint of the thing.

Right now, I can extract it from my known-hosts file with ssh-keygen -F 
and redirect that to a temporary file, and then run ssh-keygen -l, over 
it, or ssh-keygen -l -v, or ssh-keygen -B...

I note that -l will not print a fingerprint if -B is on the same line.  -B 
seems to override -l (regardsless of which comes first).

I also note that -v prints the ascii art representation when used with -B 
alone, though the manpage makes no reference to this intercompatibility.

Regardless, doing it in one sweep (extracting and fingerprinting) still 
requires that intermediate step.  ssh-keygen doesn't seem to accept the 
standard -f - (stdin) argument, nor can I say -f /dev/stdin

So I suppose there are a few questions.

1) Does anyone have a better way to do this?

2) Is it worth filing feature requests to modify -f to accept stdin?

3) Is it worth filing a feature request to make -l and -B usable in the 
same command?

4) Or in fact for those commands to work with -F, meaning "find any key 
matching foo in my known_hosts and print the fingerprint in this format".

-Dan Mahoney

-- 

"There is no right and wrong, there is only fun and boring."

-Fisher Stevens, "Hackers"

--------Dan Mahoney--------
Techie,  Sysadmin,  WebGeek
Gushi on efnet/undernet IRC
ICQ: 13735144   AIM: LarpGM
Site:  http://www.gushi.org
---------------------------