title: Install 'yum' in Centos7
body: <p>I've deleted <strong>yum</strong> from my server and I did wget to download <strong>yum</strong> again and extract it. In this folder, I have a lot of files:</p>
  
  <pre><code>AUTHORS      completion-helper.py  Makefile   shell.py  yumcommands.py
  bin          COPYING               output.py  test      yum-cron
  callback.py  docs                  po         TODO      yummain.py
  ChangeLog    etc                   README     utils.py  yum.spec
  cli.py       INSTALL               rpmUtils   yum       yum-updatesd.py
  </code></pre>
  
  <p>How can I install it?</p>