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ls -l

-rwxr-xr-x  1 root     root   885 2010-07-08 13:55 /etc/backup-number-of-files*
-rwxrwxr-x+ 1 levchuk  Users 1067 2010-08-30 14:37 /etc/backup-running-time*

Please notice the + on the 2nd line.

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1 Answer 1

up vote 3 down vote accepted

In my mind it's always been an indicator that additional permissions are available in the form of ACLs. You should then be able to use getfacl to see what those ACLs are.

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You know, I've worked with Unix systems for decades, and I was dimly aware there was an ACL system, but I've never ever seen it used and hadn't a clue how to use it myself. –  Omnifarious Oct 12 '10 at 19:17
    
I've never seen it documented in an ls man page which is why I said "In my mind." Default ACLs can be very useful as a way to work around complex grouping hierarchies, group membership limitations, and permission problems (as generally bestowed by poor SFTP clients). –  Kaleb Pederson Oct 12 '10 at 20:08
    
Oh... and ACL implementations vary across the board. getfacl works on Linux and (at least some) Solaris, but I've been on other systems that use a completely different implementation. –  Kaleb Pederson Oct 12 '10 at 20:15
    
I believe there's a POSIX spec (that I've only glanced at briefly) for how they're supposed to work. I didn't realize that anybody implemented it. ;-) I generally disfavor ACLs as I think they lead to excessive complexity and it can become very hard to write code that has a predictable outcome when checking them. But I agree that they are a very nice tool to have if you absolutely need them. –  Omnifarious Oct 12 '10 at 20:18

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