#!/bin/bash
#Author:Surendra Kumar Anne
#Purpose:To automate user creation
#Date/Time:06-08-2011.19:10
mkdir -p /home/admin/useraccounts

for (( i=0; i<=500; i++ ))

do

#Create users whose name starts with baci,

#so this script will create baci1, baci2, baci3 etc depending on i value.

useradd baci$i

#this command is bit tricky, < /dev/urandom

#will generate all the random characters which are not even present

#on keyboard.. and tr -dc A-Na-n1-9, will display only characters

#which are from A to N, a to n and 1 to 9. This is to avoide o(small o),

#O(capital o), 0(numerical zero) characters in order to remove

#confusion in the password.  #And there is no character limit.   so head -c8

#will limit the random characters to just 8

< /dev/urandom tr -dc A-Na-n1-9_ | head -c8 > /tmp/passwd.txt

#As this is an automated shell script, the below command will take

#password from STDIN(--stdin) ie /tmp/passwd.txt

cat /tmp/passwd.txt | passwd --stdin user$i

echo -e "Username:baci$i" > /home/admin/useraccounts/baci$i

 echo -e "password:" >> /home/admin/useraccounts/baci$i

cat /tmp/passwd.txt >> /home/admin/useraccounts/baci$i

done

rm -rf /tmp/passwd.txt