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Convert SSH => OPENSSH
puttygen sshpriv.key -O private-openssh -o opensshpriv.keyMultiple identities
You can setup multiple ssh keys on your host by following config.
Bitbucket + Github
File ~/.ssh/config
Host github.com    User username    HostName github.com    IdentityFile ~/.ssh/rsa_github    IdentitiesOnly yesHost bitbucket.org    User username    HostName bitbucket.org    IdentityFile ~/.ssh/rsa_bitbucket    IdentitiesOnly yesMultiple Bitbucket/Github
File ~/.ssh/config
Host personal.bitbucket.org    User username1    HostName personal.bitbucket.org    IdentityFile ~/.ssh/rsa_bitbucket1    IdentitiesOnly yesHost work.bitbucket.org    User username2    HostName work.bitbucket.org    IdentityFile ~/.ssh/rsa_bitbucket2    IdentitiesOnly yesBitbucket for example has a wildcard DNS.
$ host personal.bitbucket.orgpersonal.bitbucket.org is an alias for bitbucket.org.bitbucket.org has address 104.192.143.1bitbucket.org has address 104.192.143.2bitbucket.org has address 104.192.143.3$ host work.bitbucket.orgwork.bitbucket.org is an alias for bitbucket.org.bitbucket.org has address 104.192.143.1bitbucket.org has address 104.192.143.3bitbucket.org has address 104.192.143.2Github unfortunately does not have.