Authorized Keys with options

[syxolk]

The authorized key may start with options:

Protocol 2 public key consist of: options, keytype, base64-encoded key, comment. The options field is optional; its presence is determined by whether the line starts with a number or not (the options field never starts with a number). The bits, exponent, modulus, and comment fields give the RSA key for protocol version 1; the comment field is not used for anything (but may be convenient for the user to identify the key).

[syxolk]

• https://serverfault.com/a/143004
• https://web.archive.org/web/20101218001225/http://www.eng.cam.ac.uk/help/jpmg/ssh/authorized_keys_howto.html