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What is the plus sign at the end of the permissions telling me?

ls -l
total 4
drwxrwxrwx+ 2 benson avahi-autoipd 4096 Jan 27 17:37 docs

Here's the context:

cat /etc/issue
\CentOS release 5.3 (Final)
Kernel \r on an \m
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up vote 53 down vote accepted

It means your file has extended permissions called ACLs.

You have to run getfacl <file> to see the full permissions.

See Access Control Lists for more details.

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ls -le on Mac OS X. – mattdipasquale Oct 25 '15 at 14:15

via man page 'ls'

"If the file or directory has extended security information, the permissions field printed by the -l option is followed by a '+' character."

This generally means the file is encumbered with access restrictions outside of the traditional Unix permissions - likely Access Control List (ACL).

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"encumbered with access restrictions" - does that mean that a file or directory without a + has less restrictions? – squarecandy Mar 22 at 22:00

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