ssh:authorized-keys:remove

The command sed -i '${key-to-remove}' ~/.ssh/authorized_keys is a sed command used to remove a specific key from the authorized_keys file located in the ~/.ssh directory.

Here is the breakdown of each part of the command:

• sed is a stream editor used to perform text transformations on input streams.
• -i is an option for sed that tells it to edit the file in-place, meaning it will modify the file directly instead of printing the modified output to the standard output.
• ${key-to-remove} is a placeholder that should be replaced with the actual key you want to remove. It represents the pattern you want to match in the authorized_keys file.
• ~/.ssh/authorized_keys is the path to the authorized_keys file in the ~/.ssh directory. This is the file that will be edited by the sed command.

When you run this command, sed will search for lines in the authorized_keys file that match the specified key pattern and remove them from the file. The file will be updated with the removal of the key.