Installing PdfExport extension for mediawiki

To install pdfExport extension use following steps:

Visit http://www.mediawiki.org/wiki/Special:ExtensionDistributor/PdfExport and download version of PdfExport compatible with Mediawiki version installed
Copy the link and do wget of link in wiki extensions folder. You can also download the file using browser and copy it to extensions folder.
"tar xzf PdfExport*.tar.gz" in extensions folder
rm -f PdfExport*.tar.gz
yum -y install htmldoc
Edit 'LocalSettings.php' and append:
```
require_once("$IP/extensions/PdfExport/PdfExport.php");
$wgPdfExportHtmlDocPath = '/usr/bin/htmldoc';
```
It is good idea to verify location of htmldoc package using 'which htmldoc' command
The PdfExport extension assumes writable folder named tmp inside $wgUploadDirectory. Hence go to upload directory and create a folder named 'tmp' inside it. Change the permissions on this folder to '777'.

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