Convert .ppk key for ssh connection on linux

If you want to use a ssh key as a .ppk file (putty format) on linux, first you need to convert it.

To do it, install putty-tools:

sudo apt-get install putty-tools 

Now you can convert your key from .ppk format to .key format:

puttygen <your_key_name>.ppk -O private-openssh -o <your_key_name>.key 

And voilà! 😀
You can use it to open your ssh connection:

ssh -i <your_key_name>.key <user>@<server-ip>