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On Tue, 22 Jun 2010, Dan Mahoney, System Admin wrote:
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/stdinSo 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".
To followup, it looks like -F works with -l, or -B, and in either case, -v causes the ascii-art to be shown as well, but -l and -B being mutually exclusive seems like a bug.
Also, the manpage usage syntax is off: Instead of: ssh-keygen -l [-f input_keyfile] ssh-keygen -B [-f input_keyfile] ssh-keygen -F hostname [-f known_hosts_file] It should might say: ssh-keygen -l [-v] [-f input_keyfile] ssh-keygen -B [-v] [-f input_keyfile] ssh-keygen -F [[-B |-l ] -v] hostname [-f known_hosts_file]And the usage statements for the l, B, and F options should note that these are chainable.
Should I open bug reports? -Dan -- "I wish the Real World would just stop hassling me!" -Matchbox 20, Real World, off the album "Yourself or Someone Like You" --------Dan Mahoney-------- Techie, Sysadmin, WebGeek Gushi on efnet/undernet IRC ICQ: 13735144 AIM: LarpGM Site: http://www.gushi.org ---------------------------
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