Convert PPK file to PEM

To convert putty PPK format file to Linux OpenSSL format, run

puttygen SSH_KEY.ppk -O private-openssh -o SSH_KEY.pem  

To install puttygen,

On CentOS

yum install putty -y

On Debian/Ubuntu

apt-get install putty-tools -y

Related Posts

puttygen: error loading x.ppk: PuTTY key format too new

Remove SSH Private Key Passphrase

SSH