The difference and usage of chown and chmod in Linux

chmod Modify the first column of content,chown Modify the contents of 3rd, 4 columns:

Chown usage:

The user name and user group used to change a directory or file.

Chown User name: Group name file path (can be an absolute path or a relative path)

Example 1:chown ROOT:ROOT/TMP/TMP1

is to change the TMP1 username and user Group under TMP to root and root (only the genus Group of TMP1 is modified).

Example 2:chown-r ROOT:ROOT/TMP/TMP1

is to change the group of all files under TMP1 under TMP to root and root.

chmod usage:

Used to modify access permissions for a directory or file.

Syntax: chmod [-CFVR] [--help] [--version] [who] [+ |-| =] [mode] File name

Example: Chmod-r 777/home/linux

For a detailed explanation of permissions, refer to: http://www.cnblogs.com/EasonJim/p/6525280.html

-C: If the file permissions have changed, the change action will be displayed
-F: Do not display an error message if the file permissions cannot be changed
-V: Show details of permission changes
-r: The same permissions change for all files in the current directory and subdirectories (that is, they are changed in a recursive manner)
--HELP: Show Auxiliary Instructions
--version: Display version

Action object who is either or a combination of the following letters: U means "user", that is, the owner of the file or directory. 　　G means "same group user", that is, all users who have the same group ID as the file owner. 　　O means "other (others) users". A means "all users". It is the system default value.
The action symbol can be: + Add a permission. 　　-Cancels a permission. = gives the given permission and cancels all other permissions, if any.
Setting the permissions represented by mode can be any combination of the following letters: R is readable. W writable. 　　   x executable. 　　x append the x attribute only if the destination file is executable to some users, or if the target file is a directory. S is the owner of the file in which the owner or group ID of the process is placed when the file is executed. 　　The       Way "U+s" sets the user ID bit of the file, "G+s" sets the group ID bit. 　　T save the program's text to the swap device. 　　You have the same permissions as the owner of the file. 　　G has the same permissions as a user with the same group as the file owner. o have the same permissions as other users.
File name: A list of files separated by spaces to change permissions, and wildcard characters are supported.

The difference and usage of chown and chmod in Linux