Lesson 2.2: Use Looping constructs (for, etc.) to process file, command line input
Example 1: Create users and set the password to same as the username, but expire the password in first logon.The user list should be stored in a txt file.
[root@client scripts]# cat developers developer1 developer2 developer3 developer4 developer5 developer6 developer7 developer8 developer9 developer10 [root@client scripts]# cat developeradd.sh for i in $(cat /home/sanjeeb/scripts/developers) do useradd $i echo $i | passwd --stdin $i chage -d 0 $i done echo "Developers account created" [root@client scripts]# cat /etc/passwd developer1:x:1003:1003::/home/developer1:/bin/bash developer2:x:1004:1004::/home/developer2:/bin/bash developer3:x:1005:1005::/home/developer3:/bin/bash developer4:x:1006:1006::/home/developer4:/bin/bash developer5:x:1007:1007::/home/developer5:/bin/bash developer6:x:1008:1008::/home/developer6:/bin/bash developer7:x:1009:1009::/home/developer7:/bin/bash developer8:x:1010:1010::/home/developer8:/bin/bash developer9:x:1011:1011::/home/developer9:/bin/bash
Example 2: Deleting the recently added users
[root@client scripts]# cat deleteusers.sh for i in $( cut -f 1 -d: /home/sanjeeb/scripts/userslist.txt ) do userdel $i echo "User $i deleted !" done [root@client scripts]# deleteusers.sh User developer1 deleted ! User developer2 deleted ! User developer3 deleted ! User developer4 deleted ! User developer5 deleted ! User developer6 deleted ! User developer7 deleted ! User developer8 deleted ! User developer9 deleted ! User developer10 deleted !