====== Drupal core update ======
\\
<WRAP prewrap center>
<code>
cd /usr/share/siteRoot

drush archive-dump --destination=/home/user/site.tar
       Drupal version                  :  7.26
       ...

drush vset --exact maintenance_mode 1

drush up

drush core-status
       Drupal version                  :  7.28
       ...
</code>
</WRAP>