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+[#]: collector: (lujun9972)
+[#]: translator: ( )
+[#]: reviewer: ( )
+[#]: publisher: ( )
+[#]: url: ( )
+[#]: subject: (Bash Script to Send eMail With a List of User Accounts Expiring in “X” Days)
+[#]: via: (https://www.2daygeek.com/bash-script-to-check-user-account-password-expiry-linux/)
+[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
+
+Bash Script to Send eMail With a List of User Accounts Expiring in “X” Days
+======
+
+The password enforcement policy is common to all operating systems and applications.
+
+If you want to **[implement a password enforcement policy on Linux][1]**, go to the following article.
+
+The password enforcement policy will be enforced by most companies by default, but the time period will be different depending on the company’s requirements.
+
+Usually everyone uses a 90-days password cycle.
+
+The user will only **[change the password][2]** on some of the servers they use, and they won’t change the password on the servers they don’t use often.
+
+In particular, most team forget to change the service account password, which can lead to breaking regular jobs even if they are configured to work with **[SSH key-based authentication][3]**.
+
+SSH key-based authentication and **[cronjobs][4]** will not work if the user account password expires.
+
+To avoid this situation, we have created a **[shell script][5]** that sends you a list of user accounts that expire within 10 days.
+
+There are two **[bash scripts][6]** included in this tutorial that will help you collect information about user expiration days on your system.
+
+### 1) Bash Script to Check List of User Accounts Expiring in 10 Days
+
+This script will help you to check the list of user accounts that expire in 10 days on your terminal.
+
+```
+# vi /opt/script/user-password-expiry.sh
+
+#!/bin/sh
+/tmp/user-expiry-1.txt
+/tmp/user-expiry.txt
+echo "-------------------------------------------------"
+echo "UserName  The number of days the password expires"
+echo "-------------------------------------------------"
+for usern in u1 u2 u3 u4
+do
+today=$(date +%s)
+userexpdate=$(chage -l $usern | grep 'Password expires' |cut -d: -f2)
+passexp=$(date -d "$userexpdate" "+%s")
+exp=`expr \( $passexp - $today \)`
+expday=`expr \( $exp / 86400 \)`
+echo "$usern $expday" >> /tmp/user-expiry.txt
+done
+cat /tmp/user-expiry.txt | awk '$2 <= 10' > /tmp/user-expiry-1.txt
+cat /tmp/user-expiry-1.txt | column -t
+```
+
+Set an executable Linux file permission to **“user-password-expiry.sh”** file.
+
+```
+# chmod +x /opt/script/user-password-expiry.sh
+```
+
+You will get an output like the one below. But the username and days may be different
+
+```
+# sh /opt/script/user-password-expiry.sh
+
+-------------------------------------------------
+UserName  The number of days the password expires
+-------------------------------------------------
+u1         -25
+u2          9
+u3          3
+u4          5
+```
+
+### 2) Bash Script to Send eMail With a List of User Accounts Expiring in 10 Days
+
+This script will send a mail with a list of user accounts expiring in 10 days.
+
+```
+# vi /opt/script/user-password-expiry-mail.sh
+
+#!/bin/sh
+SUBJECT="Information About User Password Expiration on "`date`""
+MESSAGE="/tmp/user-expiry.txt"
+MESSAGE1="/tmp/user-expiry-1.txt"
+TO="[email protected]"
+echo "-------------------------------------------------" >> $MESSAGE1
+echo "UserName  The number of days the password expires" >> $MESSAGE1
+echo "-------------------------------------------------" >> $MESSAGE1
+for usern in u1 u2 u3 u4
+do
+today=$(date +%s)
+userexpdate=$(chage -l $usern | grep 'Password expires' |cut -d: -f2)
+passexp=$(date -d "$userexpdate" "+%s")
+exp=`expr \( $passexp - $today \)`
+expday=`expr \( $exp / 86400 \)`
+echo "$usern $expday" >> $MESSAGE
+done
+cat $MESSAGE | awk '$2 <= 10' >> $MESSAGE1
+mail -s "$SUBJECT" "$TO" < $MESSAGE1
+rm $MESSAGE
+rm $MESSAGE1
+```
+
+Set an executable Linux file permission to **“user-password-expiry-mail.sh”** file.
+
+```
+# chmod +x /opt/script/user-password-expiry-mail.sh
+```
+
+Finally add a **[cronjob][4]** to automate this. It runs once in a day at 8AM.
+
+```
+# crontab -e
+0 8 * * * /bin/bash /opt/script/user-password-expiry-mail.sh
+```
+
+You will receive a mail similar to the first shell script output.
+
+--------------------------------------------------------------------------------
+
+via: https://www.2daygeek.com/bash-script-to-check-user-account-password-expiry-linux/
+
+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/how-to-set-password-complexity-policy-on-linux/
+[2]: https://www.2daygeek.com/linux-passwd-chpasswd-command-set-update-change-users-password-in-linux-using-shell-script/
+[3]: https://www.2daygeek.com/configure-setup-passwordless-ssh-key-based-authentication-linux/
+[4]: https://www.2daygeek.com/linux-crontab-cron-job-to-schedule-jobs-task/
+[5]: https://www.2daygeek.com/category/shell-script/
+[6]: https://www.2daygeek.com/category/bash-script/