Set file Permissions on Linux and ACL

Using chmod, chown chgrp

Change File / Directories permissions.

chmod 0777 . -R #
chmod g+s /var/www #
chmod +x *.sh #

Change File / Folder Owner.

chown www-data:www-data -R .

Change File / Directories Group.

chgrp www-data . -R

Using ACL

Note : Install the alc package if not already installed

Set file / Folder permissions

1. Add ACL optin to the /etc/fstab mount moints
/dev/yourrootmapper / ext4 errors=remount-ro,acl 0 1

2. Re Mount
mount -oremount /

3.1 Set custom permission to the directory you want
sudo setfacl -dm u::rwx,g::rwx,o::r /var/www

3.2 Set custom group permission
sudo setfacl -m "default:group::rwx" /var/www

3.3 Set default gruop
sudo setfacl -Rdm g:apache:rx /var/www

Set Default User/permission (NOT TESTED)
sudo setfacl -d -m default:user:the_name:rwx
sudo setfacl -d -m default:group:the_name:rwx

4. Get ACL Permissions list
getfacl /my/folder