时长阅读man手册，对编程思维有非常大的帮助，尤其对于已经从事Linux类岗位超过5年+的小伙伴，加油。

apt-key man帮助手册如下。

root@hanyw:~# man apt-key  |grep -Ev '^$'APT-KEY(8)                                   APT                                  APT-KEY(8)NAME       apt-key - Deprecated APT key management utilitySYNOPSIS       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-  | sudo apt-key add -       Then you can directly replace this with (though note the recommendation below):       wget -qO-  | 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 <apt@packages.debian.org>.AUTHORS       Jason Gunthorpe       APT teamNOTES        1. APT bug page            2.4.8                             22 February 2022                            APT-KEY(8)