Detailed introduction to Ubuntu system username, password, and hostname management

1. Add user

Command: sudo useradd -m username -s /bin/bash

Interpretation: Create a username user who can log in, and use /bin /bash as shell

2. Set initial password or change password

Command: sudo passwd username

Interpretation: After executing the command, the interface waiting for password input will appear.

3. Add user as administrator

Command: sudo adduser username sudo

4. DeleteUser

Command: sudo deluser username

Interpretation: Delete user

Command: sudo userdel -r username

Interpretation: Delete the user and all related content of this user

5. View the host name

Command: hostname or uname –n

Interpretation: The host name can also be seen in the command prompt , the host name is usually located after the "@" symbol

##6. Temporarily modify the host name

Command: hostname newhostname

Interpretation: In this way, the new host name is not saved in the system , the host name will be restored to the original host name after the system is restarted; the effective host name will not be displayed immediately under the terminal. Only by reopening a terminal window (the terminal connected through ssh needs to be reconnected)

7. Permanently modify the host name

In the Ubuntu system, the host name is stored in the /etc/hostname file. Edit the hostname file, enter the new host name in the file and save the file

8. The difference between /etc/hostname and /etc/hosts

/etc/hostname stores the host name

/etc /hosts is a file that configures IP addresses and their corresponding host names. Here you can record the IP addresses of the local machine or other hosts and their corresponding host names

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