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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

but am confused where is the private key while it only shows the public one.

What shows only the private key? Did you try:

gpg --list-secret-key keyid

Quote:

Originally Posted by ajeetraina

Is Secret key a private key?If so why are they same?

Yes, they are the same. Why shouldn't they be?

Public key crypto is based on key pairs. You have a secret key which is used for signing and decryption. You keep this key secret, on your computer. The other key in the pair is a public key, used by others for encrypting to you and verifying your signatures. You can mail this key to people, link it from a web page, or put it on public keyservers.

You need to do some research and understand this tool or you will do something bad to yourself