Generate Public Key From A Private Key

When we've got the private key, say id_rsa,  we can regenerate the public key by:

ssh-keygen -f ./id_rsa -y > ./id_rsa.pub

It is well-explained in ‘man ssh-keygen’:

-y    This option will read a private OpenSSH format file and print an OpenSSH public key to stdout.
-f    Specify the private key file.

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