跟老韓學Ubuntu Server2204,apt-key幫助手冊

時長閱讀man手冊，對程式設計思維有非常大的幫助，尤其對于已經從事Linux類崗位超過5年+的小夥伴，加油。

apt-key man幫助手冊如下。

root@hanyw:~# man apt-key  |grep -Ev '^#39;
APT-KEY(8)                                   APT                                  APT-KEY(8)
NAME
       apt-key - Deprecated APT key management utility
SYNOPSIS
       apt-key [--keyring filename] {add filename | del keyid | export keyid | exportall |
               list | finger | adv | update | net-update | {-v | --version} | {-h | --help}}
DESCRIPTION
       apt-key is used to manage the list of keys used by apt to authenticate packages.
       Packages which have been authenticated using these keys will be considered trusted.
       Use of apt-key is deprecated, except for the use of apt-key del in maintainer scripts
       to remove existing keys from the main keyring. If such usage of apt-key is desired
       the additional installation of the GNU Privacy Guard suite (packaged in gnupg) is
       required.
       apt-key(8) will last be available in Debian 11 and Ubuntu 22.04.
SUPPORTED KEYRING FILES
       apt-key supports only the binary OpenPGP format (also known as "GPG key public ring")
       in files with the "gpg" extension, not the keybox database format introduced in newer
       gpg(1) versions as default for keyring files. Binary keyring files intended to be
       used with any apt version should therefore always be created with gpg --export.
       Alternatively, if all systems which should be using the created keyring have at least
       apt version >= 1.4 installed, you can use the ASCII armored format with the "asc"
       extension instead which can be created with gpg --armor --export.
COMMANDS
       add filename (deprecated)
           Add a new key to the list of trusted keys. The key is read from the filename
           given with the parameter filename or if the filename is - from standard input.
           It is critical that keys added manually via apt-key are verified to belong to the
           owner of the repositories they claim to be for otherwise the apt-secure(8)
           infrastructure is completely undermined.
           Note: Instead of using this command a keyring should be placed directly in the
           /etc/apt/trusted.gpg.d/ directory with a descriptive name and either "gpg" or
           "asc" as file extension.
       del keyid (mostly deprecated)
           Remove a key from the list of trusted keys.
       export keyid (deprecated)
           Output the key keyid to standard output.
       exportall (deprecated)
           Output all trusted keys to standard output.
       list, finger (deprecated)
           List trusted keys with fingerprints.
       adv (deprecated)
           Pass advanced options to gpg. With adv --recv-key you can e.g. download key from
           keyservers directly into the trusted set of keys. Note that there are no checks
           performed, so it is easy to completely undermine the apt-secure(8) infrastructure
           if used without care.
       update (deprecated)
           Update the local keyring with the archive keyring and remove from the local
           keyring the archive keys which are no longer valid. The archive keyring is
           shipped in the archive-keyring package of your distribution, e.g. the
           ubuntu-keyring package in Ubuntu.
           Note that a distribution does not need to and in fact should not use this command
           any longer and instead ship keyring files in the /etc/apt/trusted.gpg.d/
           directory directly as this avoids a dependency on gnupg and it is easier to
           manage keys by simply adding and removing files for maintainers and users alike.
       net-update (deprecated)
           Perform an update working similarly to the update command above, but get the
           archive keyring from a URI instead and validate it against a master key. This
           requires an installed wget(1) and an APT build configured to have a server to
           fetch from and a master keyring to validate. APT in Debian does not support this
           command, relying on update instead, but Ubuntu's APT does.
OPTIONS
       Note that options need to be defined before the commands described in the previous
       section.
       --keyring filename (deprecated)
           With this option it is possible to specify a particular keyring file the command
           should operate on. The default is that a command is executed on the trusted.gpg
           file as well as on all parts in the trusted.gpg.d directory, though trusted.gpg
           is the primary keyring which means that e.g. new keys are added to this one.
DEPRECATION
       Except for using apt-key del in maintainer scripts, the use of apt-key is deprecated.
       This section shows how to replace existing use of apt-key.
       If your existing use of apt-key add looks like this:
       wget -qO- https://myrepo.example/myrepo.asc | sudo apt-key add -
       Then you can directly replace this with (though note the recommendation below):
       wget -qO- https://myrepo.example/myrepo.asc | sudo tee
       /etc/apt/trusted.gpg.d/myrepo.asc
       Make sure to use the "asc" extension for ASCII armored keys and the "gpg" extension
       for the binary OpenPGP format (also known as "GPG key public ring"). The binary
       OpenPGP format works for all apt versions, while the ASCII armored format works for
       apt version >= 1.4.
       Recommended: Instead of placing keys into the /etc/apt/trusted.gpg.d directory, you
       can place them anywhere on your filesystem by using the Signed-By option in your
       sources.list and pointing to the filename of the key. See sources.list(5) for
       details. Since APT 2.4, /etc/apt/keyrings is provided as the recommended location for
       keys not managed by packages. When using a deb822-style sources.list, and with apt
       version >= 2.4, the Signed-By option can also be used to include the full ASCII
       armored keyring directly in the sources.list without an additional file.
FILES
       /etc/apt/trusted.gpg
           Keyring of local trusted keys, new keys will be added here. Configuration Item:
           Dir::Etc::Trusted.
       /etc/apt/trusted.gpg.d/
           File fragments for the trusted keys, additional keyrings can be stored here (by
           other packages or the administrator). Configuration Item Dir::Etc::TrustedParts.
       /etc/apt/keyrings/
           Place to store additional keyrings to be used with Signed-By.
SEE ALSO
       apt-get(8), apt-secure(8)
BUGS
       APT bug page[1]. If you wish to report a bug in APT, please see
       /usr/share/doc/debian/bug-reporting.txt or the reportbug(1) command.
AUTHOR
       APT was written by the APT team <[email protected]>.
AUTHORS
       Jason Gunthorpe
       APT team
NOTES
        1. APT bug page
           http://bugs.debian.org/src:apt
APT 2.4.8                             22 February 2022                            APT-KEY(8)