我正在尝试自学如何使用加密密钥，并且我一直在尝试使用我发现的这个旧的 Linus Torvalds 密钥956EB7BF449FA3AB。
我有兴趣显示使用标志，但既不显示gpg2 --list-keys 449FA3AB也不gpg2 --fingerprint 449FA3AB显示使用标志。
我发现获取使用标志信息的唯一方法是这种骇人听闻的方式。
$ gpg2 --edit-key 449FA3AB
gpg (GnuPG) 2.0.26; Copyright (C) 2013 Free Software Foundation, Inc.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
pub 1024D/449FA3AB created: 1999-10-05 expired: 2001-10-04 usage: SCA
trust: unknown validity: expired
sub 2048g/BFF491C5 created: 1999-10-05 expired: 2001-10-04 usage: E
[ expired] (1). Linus Torvalds <torvalds@transmeta.com>
gpg> quit …