Linux creates multiple users and assigns random passwords without using circular statements

Last Update:2016-09-20 Source: Internet

Author: User

Tags echo command stdin

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Linux creates multiple users and assigns random passwords that require no loop statements.

Method One

Use basic commands Useradd and passwd to add users and add passwords.

(Note: Random generation of Numbers (3-5). ）

Create a user

[Email protected] ~]# Useradd stu01

Creating multiple users is to repeat the above commands multiple times, but one input can be cumbersome, but we could make a sequence of the strings, and then replace the sequence with the above format using the alternate method.

[[email protected] ~]# SEQ 10

[Email protected] ~]#

Then we use the SED command to replace the above sequence with the command we need.

[Email protected] ~]# seq-w 10|sed-r ' s# (. *) #useradd stu\1#g '

Useradd stu01

Useradd stu02

Useradd stu03

Useradd stu04

Useradd stu05

Useradd stu06

Useradd stu07

Useradd stu08

Useradd stu09

Useradd STU10

[Email protected] ~]#

This allows us to create multiple users at once, simply by streaming the above content to bash to execute the command.

[Email protected] ~]# seq-w 10|sed-r "s# (. *) #useradd stu\1#g" |bash

[Email protected] ~]# TAIL-10/ETC/PASSWD

Stu01:x:503:503::/home/stu01:/bin/bash

Stu02:x:504:504::/home/stu02:/bin/bash

Stu03:x:505:505::/home/stu03:/bin/bash

Stu04:x:506:506::/home/stu04:/bin/bash

Stu05:x:507:507::/home/stu05:/bin/bash

Stu06:x:508:508::/home/stu06:/bin/bash

Stu07:x:509:509::/home/stu07:/bin/bash

Stu08:x:510:510::/home/stu08:/bin/bash

Stu09:x:511:511::/home/stu09:/bin/bash

Stu10:x:512:512::/home/stu10:/bin/bash

[Email protected] ~]#

Add a random password for these 10 users

The basic idea is to create a sequence and replace it with the command we need, just like above.

[Email protected] ~]# seq-w 10|sed-r ' s# (. *) #passwd stu\1#g '

passwd stu01

passwd stu02

passwd stu03

passwd stu04

passwd stu05

passwd stu06

passwd stu07

passwd stu08

passwd stu09

passwd STU10

[Email protected] ~]#

It's a hassle to enter a password when you get here, but passwd has a parameter--stdin can directly use the echo command to pass in the password, the problem is to create a random password, here to use a random variable parameter

[[email protected] ~]# echo $ ((RANDOM))

2492

[[email protected] ~]# echo $ ((RANDOM))

15380

[[email protected] ~]# echo $ ((RANDOM))

20658

[[email protected] ~]# echo $ ((RANDOM))

24952

[Email protected] ~]#

It generates 3 to 5 random numbers that we can pass through the pipeline to passwd and then change the password.

But after the password is not seen, set equal to no settings, so we use the Append redirect to the password into a folder, so that you can add both a random password and can see how much password.

[[email protected] ~]# seq-w 10|sed-r ' s# (. *) #jack = "$ (RANDOM)"; Echo $jack |passwd--stdin stu\1;echo "stu\1: $jack" > >/mima.log#g ' |bash

Changing password for user stu01.