====== Upgrade ======
  * [[https://www.dokuwiki.org/install:upgrade|DokuWiki Upgrade]]
  * finding different files
<code>
$ find . -type f | while read line ; do diff ../dokuwiki-2020-07-29/${line} ../rostin-stage/${line} &> /dev/null ; if [[ $? != 0 ]] ; then echo $line ; fi ; done
</code>
  * deleting files listed in data/deleted.files
<code>
# cd dokuwiki-2020-07-29
# grep -v ^# data/deleted.files | while read line ; do if [[ -f $line ]] ; then echo $line ; rm -f $line ; fi ; done
</code>
  * if blank page is displayed after upgrade, there is likely a problem with some extension. Inspect **/var/apache2/2.4/logs/error_log** Apache error log to find out which extension is problematic and remove it from **lib/plugins/** directory. Then re-install the extension(s) again after upgrade is done.
====== Plug-ins ======
  * Cell Background - Allows user-defined background colored cells in tables
  * MathJax plugin - Enables MathJax (https://www.mathjax.org/) parsing of TeX math expressions in wiki pages
  * flowcharts - flowcharts utilizing Mermaid (https://mermaid-js.github.io) - requires changes in conf/entities.conf - see plugin's site for details