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158 Chapter 9 Working with File Services
Using chmod to Modify ACLs
Using chmod, you can add and delete ACEs for a file or a folder. Here are a few of the
parameters to be used with ACLs:
The following are some of the common permissions you can assign to files:
The following are the permissions applicable to folders:
To grant a user write permission for a file:
Enter the following command, replacing user1 with the name of the user you are
granting permission to and file1 with the name of the file:
$ chmod +a "
user1
allow write"
file1
To deny a guest read permission for a file:
Enter the following command, replacing file1 with the name of the file:
$ chmod +a "guest deny read"
file1
Parameter Description
+a Adds an entry to the ACL
+ai Adds an inherited entry
-a Removes an entry from the ACL
Permission Description
delete Grants permission to delete the item
readattr Read an object’s basic attributes
read Read the object
write Write to the object
writeattr Write an object’s basic attributes
readextattr Read extended attributes
writeextattr Write extended attributes
readsecurity Read an object’s extended security information (ACL)
writesecurity Write an object’s security information (ACL)
chown Change an object’s ownership
Permission Description
list List entries
add_file Add a file
add_sudirectory Add a subfolder
delete_child Delete an object