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+[#]: collector: (lujun9972)
+[#]: translator: ( )
+[#]: reviewer: ( )
+[#]: publisher: ( )
+[#]: url: ( )
+[#]: subject: (Bash Script to Send a Mail When a New User Account is Created in System)
+[#]: via: (https://www.2daygeek.com/linux-bash-script-to-monitor-user-creation-send-email/)
+[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
+
+Bash Script to Send a Mail When a New User Account is Created in System
+======
+
+There are many open source monitoring tools are currently available in market to monitor Linux systems performance.
+
+It will send an email alert when the system reaches the specified threshold limit.
+
+It monitors everything such as CPU utilization, Memory utilization, swap utilization, disk space utilization and much more.
+
+But i don’t think they have an option to monitor a new user creation activity and alert when it’s happening.
+
+If not, it doesn’t really matter as we can write our own bash script to achieve this.
+
+We had added many useful shell scripts in the past. If you want to check those, navigate to the below link.
+
+  * **[How to automate day to day activities using shell scripts?][1]**
+
+
+
+What the script does? It monitors **`/var/log/secure`**` ` file and alert admin when a new account is created in system.
+
+We can’t run this script frequently since user creation is not happening very often. However, I’m planning to run this script once in a day.
+
+So, that we can get a consolidated report about the user creation.
+
+If useradd string was found in “/var/log/secure” file for yesterday’s date, then the script will send an email alert to given email id with new users details.
+
+**Note:** You need to change the email id instead of ours.
+
+```
+# vi /opt/scripts/new-user.sh
+
+#!/bin/bash
+
+#Set the variable which equal to zero
+prev_count=0
+
+count=$(grep -i "`date --date='yesterday' '+%b %e'`" /var/log/secure | egrep -wi 'useradd' | wc -l)
+
+if [ "$prev_count" -lt "$count" ] ; then
+
+# Send a mail to given email id when errors found in log
+
+SUBJECT="ATTENTION: New User Account is created on server : `date --date='yesterday' '+%b %e'`"
+
+# This is a temp file, which is created to store the email message.
+
+MESSAGE="/tmp/new-user-logs.txt"
+
+TO="[email protected]"
+
+echo  "Hostname: `hostname`" >> $MESSAGE
+
+echo -e "\n" >> $MESSAGE
+
+echo "The New User Details are below." >> $MESSAGE
+
+echo "+------------------------------+" >> $MESSAGE
+
+grep -i "`date --date='yesterday' '+%b %e'`" /var/log/secure | egrep -wi 'useradd' | grep -v 'failed adding'| awk '{print $4,$8}' | uniq | sed 's/,/ /' >>  $MESSAGE
+
+echo "+------------------------------+" >> $MESSAGE
+
+mail -s "$SUBJECT" "$TO" < $MESSAGE
+
+rm $MESSAGE
+
+fi
+```
+
+Set an executable permission to **`new-user.sh`**` ` file.
+
+```
+$ chmod +x /opt/scripts/new-user.sh
+```
+
+Finally add a cronjob to automate this. It will run everyday at 7'o clock.
+
+```
+# crontab -e
+
+0 7 * * * /bin/bash /opt/scripts/new-user.sh
+```
+
+Note: You will be getting an email alert everyday at 7 o'clock, which is for yesterday's log.
+
+**`Output:`**` ` You will be getting an email alert similar to below.
+
+```
+# cat /tmp/logs.txt
+
+Hostname: 2g.server10.com
+
+The New User Details are below.
++------------------------------+
+2g.server10.com name=magesh
+2g.server10.com name=daygeek
++------------------------------+
+```
+
+--------------------------------------------------------------------------------
+
+via: https://www.2daygeek.com/linux-bash-script-to-monitor-user-creation-send-email/
+
+作者：[Magesh Maruthamuthu][a]
+选题：[lujun9972][b]
+译者：[译者ID](https://github.com/译者ID)
+校对：[校对者ID](https://github.com/校对者ID)
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
+
+[a]: https://www.2daygeek.com/author/magesh/
+[b]: https://github.com/lujun9972
+[1]: https://www.2daygeek.com/category/shell-script/