Usually a public SSH key is generated at the same time as a private key.
Unlike a private SSH key, it is acceptable to lose a public key as it can be generated again from a private key at any time.
In this small note i am showing how to create a public SSH key from a private one using
ssh-keygen command-line tool.
Cool Tip: Remove delay during SSH login! Read more →
Get Public SSH Key from Private
Use the following command to read a private SSH key from a file and print a public key:
$ ssh-keygen -y -f <keyfile>
||Read a private OpenSSH format file and print an OpenSSH public key to stdout|
As an example, let’s generate a public SSH key from a private key
~/.ssh/id_rsa and save it to the file
$ ssh-keygen -y -f ~/.ssh/id_rsa > ~/.ssh/id_rsa.pub