2016-2-2 Linux Basic Learning 8

One, change three categories of users (U: Genus Master   G: Group   O: other users) and their permissions
   

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chgrp: Change file group(Only administrators have permission to use)
-R: Recursively modifies the genus of directories and their internal files
--reference=path/to/somfile file ...
Refer to the genus Group of this file, set to the same group as this file

chmod: Modify file Permissions
Modify permissions for three categories of users：
chmod more File ... (8 binary notation available)
-R: Recursively modifies the owner of the directory and its internal files
--reference =path/to/somfile File ...
Refer to the owner and group of this file, and set it to belong to the same genus as this file.

modify a class of users or some kind of user rights
U Genus G Group O Other User a includes each class of users
chmod user category =more file ...

Modify a certain bit or some bit permission for a user of a class
U Genus G Group O Other User a includes each class of users
chmod user category +|-more file ...

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Practice:
1. Create a new user with no home directory OpenStack
2, copy/etc/skel for/home/openstack
3, change/home/openstack and its internal files belong to the main group of OpenStack
4,/home/openstack and its internal files, group and other users do not have any access rights
Su-openstack

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Exercise 2:
Manual nano Add user hive, basic Group Hive (500), additional group MyGroup

①nano/etc/group②nano/etc/passwd③nano/etc/shadow ...

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2016-2-2 Linux Basic Learning 8