View source for Understanding Linux Permission Sets

'''Understanding Permission Sets'''

Permission Sets provide security to your files and directories so you can either
give, or not give, permission to users to read, modify, or run those files and
directories.  Permission Sets are made up of three triplets, each of which contains
three characters.  These three characters are "R" meaning read, "W" meaning write,
and "X" meaning execute.  A dash taking the place of any of those characters in the
triplet means that the owner, group, or other user(neither the owner nor included in
a group), is denied that certain permission.  The first set of triplets dictate the
permissions to the files owners(users).  The second set of triplets dictate the
permissions for the group assigned to the file.  The third set of triplets dictate
the permissions for everyone else.

[[File:Permissions.jpg]]

There are actually ten positions in a Permission Set.  The tenth position is in
front of the rest.  It tells you the type of file that it is.  It can be a dash(regular
file), a "b"(block device), a "c"(character device), a "d"(directory), an "l"(link), or
many others.

[[File:Look_of_permissions.jpg]]