Ssh without pwd between two ipfire

I would like to ssh an ipfire host from another one, but…
-bash: ssh-copy-id: command not found
Am I missing something?
thanks for your comments,

Hi @gian

See this thread on the topic.

sorry, I forgot I had asked the same question just a while ago, must be ageing…

No problem. Done similar thing myself in another forum.

Alternative in a line of shell script:

cat ~/.ssh/ | ssh user@server "mkdir -m 700 ~/.ssh; cat >> ~/.ssh/authorized_keys; chmod 600 ~/.ssh/authorized_keys"

I really appreciate your help!