BASH: Determine if last day of month

[Jordan]

An easy way to determine if today is the last day of the month is to determine the numerical date for tomorrow. If tomorrow is "1" then you know today is the last day of the month. This holds true for months with 31 days, 30 days or for Feb. with 28.

#!/bin/bash

MYTZ=`date | awk '{print $5}'`
TOM=$(TZ=$MYTZ-24 date +%d)

if [ $TOM == 1 ]
 then
        echo "Last Day of the month!"
        # Enter your monthly code here
fi

This will allow you to create a script that executes on a monthly basis.

[Tor]

You could also use the /etc/cron.monthly and it will execute at the first of the month (or last, can't remember which) without you having to code for it.