How to display fingerprint for public key file

It is very useful to know how to distinguish between different GnuPG public key files.

Download or locate GnuPG public key file you want to check.

$ curl --silent --remote-name https://downloads.linux.hpe.com/SDR/hpePublicKey2048_key1.pub 

$ ls -l hpePublicKey2048_key1.pub
-rw-rw-r-- 1 milosz milosz 1004 paź 26 22:16 hpePublicKey2048_key1.pub

$ cat hpePublicKey2048_key1.pub 
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.12 (GNU/Linux)
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=voON
-----END PGP PUBLIC KEY BLOCK-----

Use --with-fingerprint GnuPG parameter to display fingerprint and basic information for provided public key file.

$ gpg --with-fingerprint hpePublicKey2048_key1.pub
pub   rsa2048 2015-12-10 [SCEA] [expires: 2025-12-07]
      5744 6EFD E098 E5C9 34B6  9C7D C208 ADDE 26C2 B797
uid           Hewlett Packard Enterprise Company RSA-2048-25 <signhp@hpe.com>

I can say that it is very useful at times.