LS is just a simple list of filenames, ll more detailed list of file type, file owner permissions, file owner group permissions, file size, file last modified time, etc ...
We can use a simple diagram to illustrate, such as 1:
Figure 1
1, the first place on "-", the ordinary file.
2, rw-, indicates that the file owner has read and write permissions to the Text.txt file (x position is "-" indicates no execute permission)
3, rw-, indicates that the file owner's group has read and write permissions to the Text.txt file (x position is "-" indicates no execute permission)
4, r--, indicates that other users have only read permission to the file
Note: rw-, rw-, r--, 3 bits per 3 bits read. R: Indicates Read permission, W: Indicates Modify permission, x: Represents execute permission
1) How do I modify file permissions?
U: Current user permissions, G: Permissions for current user group, O: Current Other user rights
Example: a) Add execute permissions to the current user
1 chmod u+x text.txt
b) Add write permissions to the current user group
1 chmod g+w Text.txt
c) Add read permissions to other users
1 chmod o+r Text.txt
2) How do I modify the file owner?
Example: Modifying the owner to WM
1 chown Linux WM
3) How can I modify the group that the file belongs to?
Example: Modifying an owning group to a GRP
1 chgrp Linux grp
Original address: http://www.cnblogs.com/nchar/p/3905660.html