Linux ls, ls -l, ls -l, ll command

ls is simply a list of file names in the directory, ll more detailed list of file types, file owner permissions, file owner group permissions , file size, file last modified time, etc...

We can use a simple diagram to illustrate, as shown in Figure 1:

1, first place Just "-", for ordinary files.

2, rw-, means that the file owner has read and write permissions to the Text.txt file, (x position is "-" means no execution permission)

3, rw- , indicates that the file owner group has read and write permissions to the Text.txt file, (x position is "-" indicates no execution permission)

4, r--, indicating that other users are on the file Only read permissions

Note: rw-, rw-, r--, 3 bits per 3 digits. r : indicates read permission, w : indicates modify permission, x : indicates execution permission

1) How to modify file permissions?

u : Permissions of the current user, g : Permissions of the current user group, o : Current other user permissions

Example: a) Add execution permission to the current user

1 Chmod u+x text.txt
 b) Add write permission to the current user group
 
1 chmod g+w Text.txt
 c) Add read permission to other users
 
 1 chmod o+r Text.txt
 2) How to modify the file owner? 
 Example: Modify the owner to wm
 
1 chown linux wm
 3) How do I modify the group to which the file belongs? 
 Example: Modify the group to grp
 
1 chgrp linux grp
 
 Original address: http://www.cnblogs.com/nchar/p/3905660.html