The chmod command is a command used to change file or folder permissions
Use the method for chmod [who] [+ |-| =] [mode] File name
The mode method is as follows:
The numbers correspond to characters as follows:
R=4,w=2,x=1
To rwx the property, 4+2+1=7
To rw-the attribute then 4+2=6;
To r-x the property, 4+1=7.
The WHO permission groups have the following relationships:
u: The current user of the directory or file
G: The current group of directories or files
o: Users or groups other than the current user or group of directories or files
A: All Users and Groups
Example 1 indicates to the current user, the current group to increase write permissions to the non-current users and groups to increase the execution rights.
chmod ug+w,o-x Test
Example 2 Remove all user Execute permissions
chmod a-x Test
Example 3 Adding the current user execution permission to the Test4 folder recursion
Chmod-r u+x test4
Example 4 gives the owner of the file read, write, execute (7) permissions, assign Read, execute (5) permissions to the group where the file is located, and assign execution (1) permissions to other users
chmod 751 file chmod u=rwx,g=rx,o=x file
Example 5 reserved read-only permission for all users
chmod =r file chmod 444 file chmod a-wx,a+r file
The CHGRP command is a user group used to change a file or file, and the corresponding user group can view it in etc/groups
Example 1 indicates that the user group for the Test2 file is changed to be the same as Test1
Chgrp--reference=test1 Test2
Example 2 recursively change the user group to bin for all files under the Test6 folder, where the 100-bit bin user group code
Chgrp-r bin Test6chgrp-r Test6
The Chown command is used to change the user or user group of the comment file or folder. The user can be a user name or a user ID; a group can be a group name or a group ID; a file is a list of files separated by spaces to change permissions, support wildcards, and use the format chown [options] ... Owner [: [Group]] file ...
Example 1 The user who changed the test file is root and the user group is
Chown Root:user Test
Example 2 The user who changed the test file is root and the user group is root
Chown Root:test
Example 3 changing the user group for the test file
Chown:user Test
Example 4: Change the user root of all files under the Test6 folder to user group
Chown-r-V Root:user test6
Reference Documentation:
Http://www.cnblogs.com/peida/archive/2012/11/29/2794010.html
Http://www.cnblogs.com/peida/archive/2012/12/03/2799003.html
Http://www.cnblogs.com/peida/archive/2012/12/04/2800684.html
Linux Command--chmod command &chgrp command &chown command