One Linux command per day: chown command

Chown the owner of the specified file to the specified user or group, the user can be either a user name or a user ID; a group can be a group name or a group ID; a file is a space-separated list of files to change permissions, and wildcard characters are supported. System administrators often use the Chown command to give users permission to use a file after copying it to another user's directory.

　　1. Command format:

chown [Options] ... Owner [: [Group]] file ...

　　2. Command function:

Change the file owner and group by Chown. You can use the user name and user identification number settings when you change the owner or group of the file. Ordinary users cannot change their files to other owners. Its operation permissions are generally administrators.

　3. Command parameters:

　Necessary parameters:

-C Displays information about the changed parts

-F Ignore Error messages

-H Fix Symbolic link

-R handles all files in the specified directory and its subdirectories

-V displays detailed processing information

-deference acts on the point of a symbolic link, not the linked file itself

　　Select parameters:

--reference=< directory or File > Specify the directory/file as the reference, the operation of the file/directory to the reference file/directory of the same owner and group

--from=< Current User: Current group > changes only if the current user and group are the same as the specified user and group

--HELP Display Help information

--version displaying version information

　　4. Usage examples:

Note:chown mail log2012.log only changes the owner

　　Example 1: changing owners and groups

Command:

Chown mail:mail log2012.log

　　Output:　

[[email protected] test6]# ll---xr--r--1 root users 302108 11-30 08:39 linklog.log---xr--r--1 root users 302108 11-30 08 : log2012.log-rw-r--r--1 root users     11-30 08:39 log2013.log-rw-r--r--1 root users      0 11-30 08:39 Log2014.log -rw-r--r--1 root users      0 11-30 08:39 log2015.log-rw-r--r--1 root users      0 11-30 08:39 log2016.log-rw-r--r--1 roo T users      0 11-30 08:39 log2017.log[[email protected] test6]# chown mail:mail log2012.log [[email protected] test6]# ll-  --xr--r--1 root users 302108 11-30 08:39 linklog.log---xr--r--1 mail mail  302108 11-30 08:39 log2012.log-rw-r--r--1 Root users     11-30 08:39 log2013.log-rw-r--r--1 root users      0 11-30 08:39 log2014.log-rw-r--r--1 root users
   
    0 11-30 08:39 log2015.log-rw-r--r--1 root users      0 11-30 08:39 log2016.log-rw-r--r--1 root users      0 11-30 08:39 Log2017.log[[email protected] test6]#
   

Description

　　Example 2: changing file owners and groups

Command:

Chown Root: log2012.log

　　Output:　　　　

[[email protected] test6]# LL Total 604---xr--r--1 root users 302108 11-30 08:39 linklog.log---xr--r--1 mail mail  302108 11-30 08:39 log2012.log-rw-r--r--1 root users     11-30 08:39 log2013.log-rw-r--r--1 root users      0 11-30 08:39 Lo g2014.log-rw-r--r--1 root users      0 11-30 08:39 log2015.log-rw-r--r--1 root users      0 11-30 08:39 log2016.log-rw-r-- r--1 root users      0 11-30 08:39 log2017.log[[email protected] test6]# chown root:log2012.log [[email protected] TEST6] # LL Total 604---xr--r--1 root users 302108 11-30 08:39 linklog.log---xr--r--1 root root  302108 11-30 08:39 log2012.log- rw-r--r--1 root users     11-30 08:39 log2013.log-rw-r--r--1 root users      0 11-30 08:39 log2014.log-rw-r--r--1 roo T users      0 11-30 08:39 log2015.log-rw-r--r--1 root users      0 11-30 08:39 log2016.log-rw-r--r--1 root users      0 11-30 08:39 Log2017.log[[email protected] test6]#

　　Description

　　Example 3: Changing file groups

Command:

Chown : Mail log2012.log

　　Output:　　

[[email protected] test6]# LL Total 604---xr--r--1 root users 302108 11-30 08:39 linklog.log---xr--r--1 root root  302108 11-30 08:39 log2012.log-rw-r--r--1 root users     11-30 08:39 log2013.log-rw-r--r--1 root users      0 11-30 08:39 Lo g2014.log-rw-r--r--1 root users      0 11-30 08:39 log2015.log-rw-r--r--1 root users      0 11-30 08:39 log2016.log-rw-r-- r--1 root users      0 11-30 08:39 log2017.log[[email protected] test6]# chown:mail log2012.log [[email protected] TEST6] # LL Total 604---xr--r--1 root users 302108 11-30 08:39 linklog.log---xr--r--1 root mail  302108 11-30 08:39 log2012.log- rw-r--r--1 root users     11-30 08:39 log2013.log-rw-r--r--1 root users      0 11-30 08:39 log2014.log-rw-r--r--1 roo T users      0 11-30 08:39 log2015.log-rw-r--r--1 root users      0 11-30 08:39 log2016.log-rw-r--r--1 root users      0 11-30 08:39 Log2017.log

　　Description

　　Example 4: Changing the owner and group of all files in the specified directory and its subdirectories

Command:

Chown-r-V Root:mail test6

　　Output:　　

 [[email protected] test]# lldrwxr-xr-x 2 root users 4096 11-30 08:39 test6[[email protected] test]# chown -r-v Root:mail Test6 The owner of the "Test6/log2014.log" has changed to Root:mail "Test6/linklog.log" the owner has changed to Root:mail "Test6/log2015.log" The owner has changed to Root:mail the owner of "Test6/log2013.log" has changed to Root:mail "Test6/log2012.log" owner has been reserved for root:mail "Test6/log2017.log" The owner has changed to Root:mail the owner of "Test6/log2016.log" has changed to Root:mail "Test6" the owner has changed to Root:mail[[email protected] test]# Lldrwxr-xr-x 2 root mail 4096 11-30 08:39 test6[[email protected] test]# CD test6[[email protected] test6]# ll  Total 604---xr--r--1 root mail 302108 11-30 08:39 linklog.log---xr--r--1 root mail 302108 11-30 08:39 log2012.log-rw-r--r--      1 root mail 11-30 08:39 log2013.log-rw-r--r--1 root mail 0 11-30 08:39 log2014.log-rw-r--r--1 root Mail 0 11-30 08:39 log2015.log-rw-r--r--1 root mail 0 11-30 08:39 log2016.log-rw-r--r--1 root mail 0 11-30 08:39 Log2017.log 

　　Description

One Linux command per day: chown command