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