# gpg key.gpg
pub 2048D/7FBDEF9B 2014-09-24 GNU ELPA Signing Agent <elpas...@elpa.gnu.org>
# gpg key.gpg --fingerprint
usage: gpg [options] [filename]
# gpg --fingerprint key.gpg
gpg: error reading key: public key not found
# man gpg
# mkdir tmp
# cp key.gpg tmp/pubring.gpg
# gpg --fingerprint --homedir tmp/
gpg: WARNING: unsafe permissions on homedir `tmp/'
gpg: tmp//trustdb.gpg: trustdb created
tmp//pubring.gpg
----------------
pub 2048D/7FBDEF9B 2014-09-24 [expires: 2019-09-23]
Key fingerprint = CA44 2C00 F917 74F1 7F59 D9B0 474F 0583 7FBD EF9B
uid GNU ELPA Signing Agent <elpas...@elpa.gnu.org>
# rm tmp/ -r
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