Basic Bash Scripting in Linux (Part-1)

 

Script for adding users and their password:

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(1) Method-1

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[root@itbd ~]# vim users.sh

for a in `seq 1 5`; do

useradd ituser$a;

echo pass$a | passwd --stdin ituser$a;

chage -d 0 ituser$a;

done

[root@itbd ~]# chmod +x user.sh

[root@itbd ~]# bash users.sh

(2) Method-2

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[root@itbd ~]# vim admin-user.txt mamun imran shazzad

[root@itbd ~]# vim users.sh

#!/bin/sh for a in `more admin-user.txt` do echo "$a" useradd $a echo "123" | passwd --stdin "$a" chage -d 0 $a done [root@itbd ~]# chmod +x user.sh [root@itbd ~]# bash users.sh

Method-3:

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#vim  user-list.txt

mushfiq:mushfiq123:1003:1003::/home/mushfiq:/bin/bash

testuser:testuser123:1004:1004::/home/testuser:/bin/bash

demouser:demouser123:1005:1005::/home/demouser:/bin/bash

# newusers user-list.txt                                                                                  [to create bulk users from given files in Linux system.]

# grep "mushfiq\|testuser\|demouser"  /etc/passwd                         [To check those users]