ppk to pem


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http://www.ramsmusings.com/2014/02/20/converting-a-putty-ppk-file-to-a-pem-file-for-accessing-aws-ec2-instances/

> puttygen ssh1.ppk -O private-openssh -o ssh1.pem

or

use puttygen gui -> load .ppk file -> 'conversion' tab