Quick Start Guide

FolderFileAccess Permission
tents of this directory
with ls -l, for example.
However, if they only
have execute permission
for the directory, they
can nevertheless access
certain les in this direc-
tory if they know of their
existence.
Users can create, rename
or delete les in the direc-
tory.
Users can change the
le: They can add or drop
data and can even delete
Write (w)
the contents of the le.
However, this does not
include the permission to
remove the le complete-
ly from the directory as
long as they do not have
write permissions for the
directory where the le is
located.
Users can change into
the directory and execute
Users can execute the
le. This permission is
Execute (x)
les there. If they do notonly relevant for les like
have read access to thatprograms or shell scripts,
directory they cannot listnot for text les. If the
the les but can accessoperating system can ex-
them nevertheless if they
know of their existence.
ecute the le directly,
users do not need read
permission to execute
the le. However, if the
le must me interpreted
like a shell script or a perl
program, additional read
permission is needed.
Note that access to a certain le is always dependent on the correct combination of
access permissions for the le itself and the directory it is located in.
17.5.3 Modifying File Permissions
In Linux, objects such as les or folder or processes generally belong to the user who
created or initiated them. The group which is associated with a le or a folder depends
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