When you need to get your key onto another machine, and you don't want the silly login-logout-copy-paste nonsense. Do this:
$ cat ~/.ssh/id_rsa.pub | ssh pi@pihole3bplus.local bash -c "mkdir -p .ssh && cat >> .ssh/authorized_keys"
Don't have a key? Here's how to make one
ssh-keygen
# smash the enter button
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /Users/tonymet/tmp/kaka.
Your public key has been saved in /Users/tonymet/tmp/kaka.pub.
The key fingerprint is:
SHA256:WXXXXX
The key's randomart image is:
+---[RSA 3072]----+
|o.+++=+*Bo=. |
| . xxxxxxxxx . . |
| xxxxxxxxx+ + .|
| xxxxxxxxxx = . |
| = .S . = |
| B o . |
| + . |
| . |
| |
+----[SHA256]-----+
Maybe just:
ssh-copy-id -i ~/.ssh/mykey user@host
:)