Detailed introduction to the creation of Linux batch users

It is relatively simple for a Linux administrator to create and delete users. However, if you want to create multiple users in Linux, I believe that users who have just learned Linux system management will still find it tricky, this problem is fully taken into account in the Linux system. The following describes how to solve the problem of Linux batch User Creation.

Linux provides a tool to create a large number of users, allowing you to create a large number of users immediately, as follows:
1) edit a text user file. Each column is written in the format of the/etc/passwd password file. Note that the user name, UID, and home directory of each user cannot be the same, the password column can be left blank or enter the x number. The content of user.txt in a sample file is as follows:
User001: 600: 100: user:/home/user001:/bin/bash
User002: 601: 100: user:/home/user002:/bin/bash
User003: 602: 100: user:/home/user003:/bin/bash
User004: 603: 100: user:/home/user004:/bin/bash
User005: 604: 100: user:/home/user005:/bin/bash
User006: 605: 100: user:/home/user006:/bin/bash
2) run the command/usr/sbin/newusers as root to import data from the user file user.txt, and create the user:
# Newusers <user.txt
Then, run vipw or vi/etc/passwd to check whether the data of these users is displayed in the/etc/passwd file and whether the user's home directory has been created.
3) run the/usr/sbin/pwunconv command to decode the shadow password generated by/etc/shadow and write it back to/etc/passwd, delete the shadow password column of/etc/shadow. This is to facilitate the next step in password conversion, that is, to cancel the shadow password function first.
# Pwunconv
4. Edit the password reference file for each user. The content of the example file passwd.txt is as follows:
User001: Password
User002: Password
User003: Password
User004: Password
User005: Password
User006: Password
5) run the command/usr/sbin/chpasswd as root to create the user password, chpasswd writes the password encoded by the/usr/bin/passwd command to the/etc/passwd password column.
# Chpasswd <passwd.txt
6) Confirm that the password is encoded into the/etc/passwd password column, execute the command/usr/sbin/pwconv to encode the password as shadow password, and write the result into/etc/shadow.
# Pwconv
This completes the creation of Linux batch users. Then, you can go to/home to check whether the permission settings of these users in the home directory are correct, and log on to verify that the user password is correct.

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