Is there a command I can use to verify the public key (id_rsa.pub), just the format only.
Sometimes I have added a new linebreak, sometimes the file missed the
ssh-rsa prefix, so is there a command to validate with?
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You can use
ssh-keygen for this. Despite its name it can do many more things than generating keys:
dennis@lightning:~$ ssh-keygen -l -f .ssh/id_rsa.pub 2048 68:df:b2:22:d8:43:5d:36:75:c1:d8:59:c0:8c:22:e8 Dennis Kaarsemaker (RSA) dennis@lightning:~$ ssh-keygen -l -f foo.txt foo.txt is not a public key file.