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Is it possible to extract userid from GPG public key?

I got public key only and want to know to whom it might belong. I find one possible workaround — to publish this information on keyserver — it decodes information and reveals it to public. But I'm not sure, I should do this.

Is it possible to extract userid using command line gpg?

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up vote 3 down vote accepted

Use gpg --list-packets [filename] to list all data packets, then grep for user IDs. For example:

$ gpg --export 0xDED9B508F4E10DB2 | gpg --list-packets | Egrep '^:user ID packet'
:user ID packet: "John Doe <>"

An alternative would be to use pgpdump

$ gpg --export 0xDED9B508F4E10DB2 | pgpdump | Egrep '^[[:space:]]*User ID'
    User ID - John Doe <>
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