paperkey:tldr:f1be9

This command is using a tool called "paperkey" to extract the secret key from a GnuPG key pair and store it safely in a separate file. Here's a breakdown of the parameters:

• paperkey: This is the command itself, which you are executing.
• --pubring ${path-to-public_key-gpg}: This specifies the path to the public key file associated with the key pair. The public key file usually has a .gpg extension.
• --secrets ${path-to-secret_data-txt}: This indicates the path to a text file that contains the encrypted secret key data. This file should typically have a .txt extension.
• --output ${secret_key-gpg}: This determines the output path for the extracted secret key. The secret key will be stored in a separate file, typically with a .gpg extension.

The purpose of this command is to provide a more secure way of storing the secret key by separating it from the public key. The resulting file ${secret_key-gpg} will only contain the secret key, making it easier to protect and store securely, as compared to having the secret key and public key together in a single key pair file.