$ xclip -sel clip < id_rsa.pub


##</code><code>##

fritz@laptop:~/.ssh$ ssh -T tallharry66@gitlab.com
The authenticity of host 'gitlab.com (2606:47...:a9b9)' can't be established.
ECDSA key fingerprint is SHA256:....w.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added 'gitlab.com,2606:4700:....' (ECDSA) to the list of known hosts.
tallharry66@gitlab.com: Permission denied (publickey).
fritz@laptop:~/.ssh$