Final answer:
The file used to schedule tasks for the anacron daemon is located at /etc/anacrontab and is essential for managing periodic tasks on systems that are not always running.
Step-by-step explanation:
The full path and filename of the file used to schedule tasks for the anacron daemon is typically /etc/anacrontab. This file is known as the anacron table and is essential for defining how anacron jobs are run. Anacron itself is a scheduler that does not assume that the system is running continuously, making it useful for machines that won't run 24/7. It is often employed in conjunction with cron to run tasks periodically, especially on systems that might be powered off at the time a cron job would normally execute. The /etc/anacrontab file contains the schedule for tasks that need to be run on a daily, weekly, or monthly basis, with the possibility of specifying a delay for each job to start.