set permission files wordpress

EDIT 2019

# Set uploads folder user and group to www-data
chown www-data:www-data -R wp-content/uploads/

# Set uploads folder user and group to www-data
chown www-data:www-data -R wp-content/

# Set uploads folder user and group to www-data
chown your-user:root-group -R wp-content/themes

# Set uploads folder user and group to www-data
chown your-user:root-group -R wp-content/plugins/your-plugin

# Set all directories permissions to 755
find . -type d -exec chmod 755 {} \;

# Set all files permissions to 644
find . -type f -exec chmod 644 {} \;

https://stackoverflow.com/questions/18352682/correct-file-permissions-for-wordpress

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When you setup WP you (the webserver) may need write access to the files. So the access rights may need to be loose.

chown www-data:www-data  -R * # Let Apache be owner
find . -type d -exec chmod 755 {} \;  # Change directory permissions rwxr-xr-x
find . -type f -exec chmod 644 {} \;  # Change file permissions rw-r--r--

After the setup you should tighten the access rights, according to Hardening WordPress all files except for wp-content should be writable by your user account only. wp-content must be writable by www-data too.

chown <username>:<username>  -R * # Let your useraccount be owner
chown www-data:www-data wp-content # Let apache be owner of wp-content

Maybe you want to change the contents in wp-content later on. In this case you could

    temporarily change to the user to www-data with su,
    give wp-content group write access 775 and join the group www-data or
    give your user the access rights to the folder using ACLs.

Whatever you do, make sure the files have rw permissions for www-data.