Shell script for search for no password entries and lock all accounts

#!/bin/bash
# Shell script for search for no password entries and lock all accounts
# -------------------------------------------------------------------------
# Copyright (c) 2005 nixCraft project <http://cyberciti.biz/fb/>
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------
# Set your email 
ADMINEMAIL="admin@somewhere.com"
 
### Do not change anything below ###
#LOG File
LOG="/root/nopassword.lock.log"
STATUS=0
TMPFILE="/tmp/null.mail.$$"
 
echo "-------------------------------------------------------" >>$LOG
echo "Host: $(hostname),  Run date: $(date)" >> $LOG
echo "-------------------------------------------------------" >>$LOG
 
# get all user names
USERS="$(cut -d: -f 1 /etc/passwd)"
 
# display message
echo "Searching for null password..."
for u in $USERS
do
  # find out if password is set or not (null password)
   passwd -S $u | grep -Ew "NP" >/dev/null
   if [ $? -eq 0 ]; then # if so 
     echo "$u" >> $LOG 
     passwd -l $u #lock account
     STATUS=1  #update status so that we can send an email
   fi  
done
echo "========================================================" >>$LOG 
if [ $STATUS -eq 1 ]; then
   echo "Please see $LOG file and all account with no password are locked!" >$TMPFILE
   echo "-- $(basename $0) script" >>$TMPFILE
   mail -s "Account with no password found and locked" "$ADMINEMAIL" < $TMPFILE
#   rm -f $TMPFILE
fi
Get the latest tutorials on SysAdmin, Linux/Unix, Open Source, and DevOps topics:
Category List of Unix and Linux commands
File Management cat
Firewall Alpine Awall CentOS 8 OpenSUSE RHEL 8 Ubuntu 16.04 Ubuntu 18.04 Ubuntu 20.04
Network Utilities dig host ip nmap
OpenVPN CentOS 7 CentOS 8 Debian 10 Debian 8/9 Ubuntu 18.04 Ubuntu 20.04
Package Manager apk apt
Processes Management bg chroot cron disown fg jobs killall kill pidof pstree pwdx time
Searching grep whereis which
User Information groups id lastcomm last lid/libuser-lid logname members users whoami who w
WireGuard VPN Alpine CentOS 8 Debian 10 Firewall Ubuntu 20.04
1 comment… add one
  • Arul Jul 16, 2008 @ 13:47

    Can you give me some information security measures?

Leave a Reply

Your email address will not be published. Required fields are marked *

Use HTML <pre>...</pre>, <code>...</code> and <kbd>...</kbd> for code samples.