Convert .ppk to .pem

If you’re working on a Mac, you may have encountered the problem of trying to use ssh with a .ppk (PuTTY key file). You can easily convert this file to a Mac friendly .pem file.

1. Install Homebrew
2. Install putty, which also installs puttygen:

   brew install putty

3. Generate .pem file:

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

4. Change permissions:

   chmod go-rw keyfile.pem

5. Connect:

   ssh -i keyfile.pem username@server

Enjoy