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The original command doesn't work for me - does something weird with sed (-r) and xargs (-i) with underscores all over...
This one works in OSX Lion. I haven't tested it anywhere else, but if you have bash, gpg and perl, it should work.
There are 2 alternatives - vote for the best!
For instance, if people have signed your key, this will fetch the signers' keys.
If you can do better, submit your command here.
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