ACL

Posix Access Control Lists

Docs

• http://linuxhelp.blogspot.com/2005/11/get-exact-control-over-your-files-and.html
• Using rsync with acl

Commands

setfacl

Set group writable

setfacl -R -d -m g::rwx .

FAQ

setfacl: Option -x: Invalid argument near character 16"

You only need like

setfacl -x group:somegroup