Whats wrong with this ssh-keygen command?

Question

I'm using ssh-keygen on Windows to create a fresh key pair of SSH keys. But if I execute the command I get the following error:

Too many arguments.

Command: ssh-keygen -t ed25519 -f ~/.ssh/id_local -H ~/.ssh/known_hosts_local -C "Local Hosts"

I wonder if anyone out there encountered this before or knows what's wrong with my set of command arguments.

CodingSheep

Answer 1

The -H option is supposed to optionnally use a known hosts file with -f

-H [-f known_hosts_file]

So you should use:

-H -f ~/.ssh/known_hosts_local 
   ^^^

I just tested it on Windows 10, an it does work.
-H alone would update the default ~/.ssh/known_hosts.