Change folder permissions in Ubuntu

Many operations on Ubuntu are performed on the terminal. Files managed by the sudo command are owned by the root user, which cannot be changed by the general user. On the graphic interface, you can use the permission options folder in the attribute to perform operations. However, once the file property shows that the current user has no read/write permissions, the permissions cannot be modified on the graphic interface. Common methods are as follows: sudochmod600 & times; (only the owner has read and write permissions) sudochmod644 & ti

Many operations on Ubuntu are performed on the terminal. Files managed by the sudo command are owned by the root user, which cannot be changed by the general user. On the graphic interface, you can use the permission options folder in the attribute to perform operations. However, once the file property shows that the current user has no read/write permissions, the permissions cannot be modified on the graphic interface.

The common method is as follows:

Sudo chmod 600 ××× (only the owner has read and write permissions)
Sudo chmod 644 ××× (the owner has the read and write permissions, and the group user only has the read permission)
Sudo chmod 700 ××× (only the owner has the permission to read, write, and execute the chmod)
Sudo chmod 666 ××× (everyone has read and write permissions)
Sudo chmod 777 ××× (everyone has the permission to read, write, and execute the chmod)

××× Indicates the file name (or folder name, but-ld must be added after chmod ).

To explain, the entire command is actually in the form
Sudo chmod-(representing the type) ××× (owner) ××× (group user) ××× (other Users)

Each digit of the three-digit number represents a user-type permission setting. The value ranges from 0 ~ 7, that is, the binary [000] ~ [111].

Each digit of the three binary numbers represents the read, write, and execution permissions respectively.

For example, "000" indicates that no three permissions are available, and "100" indicates read-only. In this way, we have the following correspondence:
0 [000] No Permissions
4 [1, 100] Read-Only permission
6 [110] Read and Write Permissions
7 [111] Read and Write execution Permissions

Now let's take a look at the common usage above. Try to modify the permission on your own.

Finally, the command for querying the file (or folder) Permission is attached.
Ls-l file name (Change-l to-ld in the folder ).

For more information about Ubuntu, see Ubuntu special page http://www.linuxidc.com/topicnews.aspx? Tid = 2