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copied!<p>I'll anticipate that from time to time you'll want to be able to log in as jenkins to do other tasks, and so I'll solve the more general problem. A strict answer to your question is included at the end.</p> <p><strong>Change jenkins' password without knowing it</strong></p> <p>From any account which has <a href="http://manpages.ubuntu.com/manpages/lucid/en/man8/sudo.8.html" rel="noreferrer">sudo</a> permissions, you can reset jenkins' password to something of your choosing:</p> <pre><code>sudo passwd jenkins </code></pre> <p>You may be asked first for your own password, in order to use sudo. Then you will be prompted for the new password to set for jenkins, and finally a confirmation of that new password.</p> <p>If your user with sudo rights is called joe, here's how a session might look:</p> <pre><code>joe $ sudo passwd jenkins [sudo] password for joe: **you enter joe's passwd** Enter new UNIX password: ** you enter new jenkins passwd** Retype new UNIX password: ** you enter new jenkins passwd** passwd: password updated successfully </code></pre> <p><strong>Alternative: login as jenkins without his password</strong></p> <p>Alternatively, again using sudo from a suitable other account, you can login as jenkins without being asked for his password:</p> <pre><code>sudo su - jenkins </code></pre> <p><strong>An aside: Avoiding password prompt confusion</strong></p> <p>Before issuing <code>sudo passwd jenkins</code>, we might first like to authenticate separately with sudo to avoid confusion around the question "whose password am I being asked for, now?".</p> <pre><code>sudo -v sudo passwd jenkins </code></pre> <p>After a successful authentication by sudo, there is a window (e.g. 15 minutes) where we won't be prompted to authenticate again. (Note that you can immediately invalidate (kill) this session with <code>sudo -k</code>, if you want to experiment.)</p> <p><strong>The promised strict answer</strong></p> <pre><code>sudo -u jenkins ssh-keygen </code></pre> <p>Then use cat to view the contents of the public key to be passed to github (but the path is only an example):</p> <pre><code> sudo cat ~jenkins/.ssh/id_rsa.pub </code></pre> <p>The exact location and name of the public key file depends on what you entered to the prompts of ssh-keygen, above. I've used a shortcut to jenkins' home dir, <code>~jenkins</code>.</p> <p><strong>Related Links</strong></p> <ul> <li><a href="http://manpages.ubuntu.com/manpages/lucid/en/man8/sudo.8.html" rel="noreferrer">sudo manpage</a></li> </ul>

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