Mac OS - How to set multi owner for file / dir

Are you using multi profiles on mac ?

Are you have a dir and file want to share with these profiles ? (for me, this is dropbox)

But when read/write in these files, you usually be asked for password ? 

The solution is add more owner to this file (by mouse), but when you need to add more dir, or sub dirs/files => so, using mouse and UI is terrible in this case. +_+!

Mac OS have another mod call ACL - Access Control Lists which can help you

(for full of docs, please read here: mac osx acl)

in this post, I just want to show a some simple mod I use: read/write, and how to use it:

- this is basic command structure (note as parenthesis)

$ chmod +a “<user or group> allow <permission>”

- view list of permission

$ ls -le to show acl permissions

- dirs permission:

directory: list,add_file,search,delete,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity,writesecurity,chown,file_inherit,directory_inherit

- read/write permission

readwrite: list,add_file,search,add_subdirectory,readattr,writeattr,readextattr,writeextattr,readsecurity

- how I use it to add read/write for user Kenji to Dropbox and all of it recursive

$ chmod -R +a "Kenji allow list,add_file,search,add_subdirectory,readattr,writeattr,readextattr,writeextattr,readsecurity" ~/Dropbox/