Remove unwanted PEARLib files

When you install or update Magento Commerce or one of the Magento Extensions that uses PEAR (PHP Extension and Application Repository), the files will be downloaded to {path_to_magento}/downloader/pearlib/cache/ and {path_to_magento}/downloader/pearlib/download/ within your Magento installation directory.  After installation the downloaded files are not automatically deleted.  These directories can grow quite large if they go unchecked.  Remember to run the following command after installing or upgrading Magento or a Magento Extension

$ cd {path_to_magento}
$ rm -rf downloader/pearlib/cache/* downloader/pearlib/download/*

Alternatively remove all the files and folders in these two directories using an FTP Client or a Browser File Manager within CPanel