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' Author: Keith Rogers *
'     Version 1.1      *
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Description:

The 'check_expiry.sh' script will check to see when the root password is due to expire and calculate the remaining days before expiry.

Usage: 

Place the check_expiry.sh script in your Nagios plugins directory, e.g. /usr/lib64/nagios/plugins
Add the following line into your NRPE config: "command[check_expiry]=/usr/lib64/nagios/plugins/check_expiry.sh <username>"

Create service definition in Nagios:

define service{
        use generic-service
        host_name <hostname>
        service_description Check Password Expiry for root                                                          
        check_command check_nrpe!check_expiry                                                                        
        }											     

Testing:

To test, simply paste the following lines into the script after the 'let DAYS' line

echo Expiry date from lchage is $get_expiry_date
echo Password expiry date in British date format is `date -d "$get_expiry_date" +"%d/%m/%Y"`
echo Password expiry date in epoch time is $password_expiry_date
echo The current date in British date format is `date +"%d/%m/%Y"`
echo The current date in epoch time is $current_date
echo The difference in days between the date output from lchage and the current date is $DAYS days

Changelog:

Version 1.1 (13/02/2014)

Added functionality to specify user as argument. Also added ability to detect output of 'Never' from lchage and exit with OK status.

Version 1.0 (10/02/2014)

Initial release, basic functionality.