I have a text file in /Users/Shared that I would like to be editable by all users on my Mac. The Get Info window shows that everyone has read and write access, and when I open the file with TextEdit on a non-owner account, the title bar does not state that the file is locked. Yet when I attempt to save my edits, I'm faced with the "The document could not be [saved / autosaved]. You don't have permission" popups.
I've tried adding the non-owner user to the permissions list in the Get Info window. No dice.
Outputs from ls
(with names edited):
$ ls -l /Users/
total 0
drwxr-xr-x+ 14 Guest _guest 476 7 Apr 11:14 Guest
drwxrwxrwt 45 root wheel 1530 12 Apr 17:40 Shared
drwxr-xr-x+ 15 fileowner staff 510 22 Feb 12:49 fileowner
drwxr-xr-x+ 17 admin staff 578 21 Dec 10:55 admin
$ ls -l /Users/Shared/Links.txt
-rw-rw-rw-@ 1 fileowner wheel 619 25 Feb 19:44 /Users/Shared/Links.txt
I can reproduce this behavior on two separate machines, one running 10.8 and the other 10.9, but not on the one running 10.6.
Best Answer
Notice that the permission string for /Users/Shared ends with a 't'. This indicates that the sticky bit is set for that directory. According to "man 8 sticky",
I suspect that when TextEdit tries to save a file, it first attempts to rename or remove the old file. But in a directory with the sticky bit set, only the owner can do this. Hence, the permission-based failure.
You could test this by trying something like this as user Guest
If this is successful, it shows that Guest can write to the file and that TextEdit must be renaming or removing, not just rewriting the file.