Linux Essentials-10, Rights Management Chown CHGRP chmod umask

Linux User and permissions detailed

Rights Management

Chown chgrp chmod umask

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Chown: Modify Owner

-R: Modify the directory and its internal genera group

--reference

Chown username:grpname file simultaneously modifies the genus Master Group

[Email protected] ~]# chown jameszhan:root/tmp/tmp.txt

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Chgrp: Modifying the genus Group

-R: Recursive modification of the genus Group

--reference

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chmod: Modify permissions for other groups belonging to the main group

Three types of users

U

G

O

Three types of permissions

R

W

X

chmod +rwx

RWX: Read and write execution

---: No permissions

[Email protected] t]# ll/tmp/

Total Dosage 40

-rw-r--r--. 1 root root 0 November 19:28 1btest2

Copy Permissions

Chown--reference=/tmp/abc/tmp/test

[Email protected] ~]# ll/tmp/

Total Dosage 40

-rw-r--r--. 1 jameszhan Root 0 November 19:28 1btest2

-rw-r--r--. 1 root root 0 November 19:32 23btest2

[Email protected] ~]# chown--reference=/tmp/1btest2/tmp/23btest2

[Email protected] ~]# ll/tmp/

Total Dosage 40

-rw-r--r--. 1 jameszhan Root 0 November 19:28 1btest2

-rw-r--r--. 1 jameszhan Root 0 November 19:32 23btest2

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Umask

Directory default Permissions 666

File default Permissions 777

Admin default umask=002

General user Default umask=022

[Email protected] ~]# umask

0022

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This article is from the "James Zhan Linux Advanced ops" blog, so be sure to keep this source http://jameszhan.blog.51cto.com/10980469/1875162

Linux Fundamentals-10, Rights Management Chown CHGRP chmod umask