Linux basic management

Basic linux management-general Linux technology-Linux technology and application information. For more information, see the following section. 1. User Management
Linux is divided into three types: management users, common users, and special users. The Administrator has a username, password, and home directory. The configuration files include/etc/passwd.

This file stores information of all accounts in the system and is a very important file in the system. In addition, each user has the read permission. Only the root user can read the/etc/shadow file.

Ii. File owner and permissions
D indicates the file directory,-indicates the file, and l indicates the connection file.

For a directory, the execution permission indicates whether the directory can be accessed. Whether the read permission can view the contents of the directory. The Write Permission indicates whether the directory can be created or deleted.

Related commands:
Chown -- change the owner and group attributes of a file
For example, chown-r root work_space
Chgrp-Change User Group
Chmod -- change the object access permission (1, 2, 4)

Iii. Partition Management
Fdisk
Linux allocates a variety of IDE devices to a file consisting of the first and most hd devices. Similarly, for SCSI, linux assigns a Partition Number of 1-16 to each hard disk. Each hard disk can have a maximum of four primary partitions (including extended partitions). Each extended partition occupies a primary partition number, that is, a primary partition and a maximum of four extended partitions. The primary partition is system-guided. This is the biggest difference between logic and extended partitions.