Linux user Management, user Rights Management, user group management

Linux user Management, user Rights Management, user group management

One: ls-l command explanation

• The first d indicates is the directory, if the file is-, if the connection is L
• The 2nd to 4th rwx represents the creator's operation Rights R Read, w write, x execution
• The 5th to 7th RWX indicates that the file or directory has permission to operate on the owning group.
• The following 3 R-x, in turn, represent the permissions that the file or directory has on other people, here is R read, and x Execute permissions
• The number 2 following the permission indicates the number of connections to the current directory or file;
• The name behind the data that represents the owner of the file or directory
• followed by a name that represents the group of the file or directory;
• The number followed by, for example, 4096, indicates the size of the file or directory
• followed by the date of the day, indicating when the file was created or the last modified time
• Last Name: Indicates the name of the file or directory

II: User Management useradd Add, Userdel Delete, usermod change

Detailed explanation execution command: Man

All user information in file:/etc/passwd file

1:useradd adding users; syntax

2:userdel delete user; syntax

3:usermod Modify user; syntax

Three: User group management

All the group information in/etc/group

Groupadd add a group; syntax

Groupdel Delete a group; syntax

Groupmod more Group;

Four: chmod Rights Management

• R (read) Read 4
• W (write) Write 2
• E (execute) Execution 1

1: As chmod 777 indicates, set permissions, the owner, the group, the other person's permissions are the largest, readable, writable, executable;

2:chmod Mode permission set Note string: [Ugoa] [+-=] [RWXX]

U: Indicates that the file or directory owner;

G: Representation, Group;

O: Indicate, other

+: indicates increased permissions;

-: Indicates cancellation permission;

=: Indicates set permission;

For example: chmod ugo=rwx file; chmod u+r File

V: Chown user owner and group management;

Chown document owner Management or document group management; syntax

For example: Modify the FTP directory;

sudo chown www-data:www-data ftp/

The owner of the modified FTP directory is www-data, and the group is Www-data

VERBOSE command: Man + command