ACL: Access Control List

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ACL: Access Control List
Using ACL we can give permissions to specific users/groups on a file/dir

setfacl -m : to add ACL permissions
 syn: setfacl -m <whome>:<name>:<permissions> filename

 ex: setfacl -m u:user1:rw hello.txt
     setfacl -m u:user2:r hello.txt
     setfacl -m g:dba:rwx hello.txt

setfacl -x: to remove permissions
 syn: setfacl -x <whome>:<name> filename

 ex: setfacl -x u:user1 hello.txt
     setfacl -x u:user2 hello.txt
     setfacl -x g:dba  hello.txt

getfacl: to view permissions on a file
 syn: getfacl filename
 ex: getfack hello.txt

note: for a newly created partition we have set acl,user_xattr mount options so that files in this partition can be set with ACL permissions
 tune2fs -o acl,user_xattr /dev/sda7

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