keychain:tldr:23233

The command "keychain --list" is used to display a list of SSH keys or GPG keys that are currently stored and managed by the Keychain on macOS or Linux systems.

Keychain is a utility that securely stores various types of sensitive data, including private keys for SSH or GPG encryption. It helps manage and automatically loads these keys into the SSH or GPG agent when needed, eliminating the need to enter passphrases repeatedly.

By running the "keychain --list" command, you can view the keys currently stored in the Keychain. It will provide information such as the key's identifier, type, and some additional details like expiration date or usage flags.

For example, the output of the command might look something like this:

Identities: 0: /Users/username/.ssh/id_rsa (RSA) 1: /Users/username/.ssh/id_ecdsa (ECDSA) 2: /Users/username/.gnupg/pubring.kbx (RSA)

In this case, it shows that the Keychain is managing three identities: two SSH keys (RSA and ECDSA) stored in the ".ssh" directory and one GPG key (RSA) stored in the ".gnupg" directory.

It's worth noting that the command might differ slightly depending on the operating system or version of Keychain you are using.