HOME
The default home directory.
pgp-clean [-s] keyid [keyid ...]pgp-clean takes a list of keyids on the command line and outputs an ascii-armored keyring on stdout for each key with all signatures except self-signatures stripped. Its use is to reduce the size of keys sent out after signing (e.g. with caff).
-s --export-subkeys
Do not remove subkeys. (Pruned by default.)
Use this key.
HOME
The default home directory.
GNUPGBIN
The gpg binary. Default: "gpg".
GNUPGHOME
The default working directory for gpg. Default: "$HOME/.gnupg".
$HOME/.gnupg/pubring.gpg - default GnuPG keyring
11 releases since Debian 4.0 (Etch); the text changed 9 times.