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When experimenting with the ls -l command I noticed that in the /dev folder ls -l was sometimes printing something like this in the first column :

crw-rw----+

What is this "+"? What does it mean? The man page does not give any information about this.

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This + symbol mean that the file has some additional attributes, like ACL

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You can check the ACL access given to the directory_name run getfacl directory_name to understand the access given to the users.

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