Fix wordpress file permissions

fix-wordpress-permissions.sh

#!/bin/bash
#
# This script configures WordPress file permissions based on recommendations
# from http://codex.wordpress.org/Hardening_WordPress#File_permissions
#
# Author: Michael Conigliaro <mike [at] conigliaro [dot] org>
#
# Source for this script: http://www.conigliaro.org/script-to-configure-proper-wordpress-permissions/
#
# To use this script, supply the full path to your wordpress directory
# That directory is often in /var/www, and the wordpress directory is frequently named 'wordpress'
# The example below operates on /var/www/wordpress directory
#
# sudo sh ./fix-wordpress-permissions.sh /var/www/wordpress

WP_OWNER=www-data # <-- wordpress owner
WP_GROUP=www-data # <-- wordpress group
WP_ROOT=$1 # <-- wordpress root directory
WS_GROUP=www-data # <-- webserver group

# reset to safe defaults
find ${WP_ROOT} -exec chown ${WP_OWNER}:${WP_GROUP} {} \;
find ${WP_ROOT} -type d -exec chmod 755 {} \;
find ${WP_ROOT} -type f -exec chmod 644 {} \;

# allow wordpress to manage wp-config.php (but prevent world access)
chgrp ${WS_GROUP} ${WP_ROOT}/wp-config.php
chmod 660 ${WP_ROOT}/wp-config.php

# allow wordpress to manage wp-content
find ${WP_ROOT}/wp-content -exec chgrp ${WS_GROUP} {} \;
find ${WP_ROOT}/wp-content -type d -exec chmod 775 {} \;
find ${WP_ROOT}/wp-content -type f -exec chmod 664 {} \;

You need to supply the folder your wordpress is in, e.g. ./fix-wordpress-permissions.sh wordpress:

sudo sh ./fix-wordpress-permissions.sh /var/www/wordpress-install-folder