Best Of

Went to YouTube, found this vid:

3/4 of the way through it clicked. I think.

I'm not sure if I did it correctly, but I sudo crontab -e -u root, to edit root's crontab, which it didn't have one. Filled it with the content from the cron job I had trouble implementing.

I think sudo crontab -l -u root shows what I wanted:

[blackhawkpr@pepper etc]$ sudo crontab -l -u root
[sudo] password for blackhawkpr:
# Pi-hole: A black hole for Internet advertisements
# (c) 2015, 2016 by Jacob Salmela
# Network-wide ad blocking via your Raspberry Pi
# http://pi-hole.net
# Updates ad sources every week
#
# Pi-hole is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This file is under source-control of the Pi-hole installation and update
# scripts, any changes made to this file will be overwritten when the softare
# is updated or re-installed. Please make any changes to the appropriate crontab
# or other cron file snippets.

# Your container name goes here:
DOCKER_NAME=pihole
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

# Pi-hole: Update the ad sources once a week on Sunday at 01:59
#          Download any updates from the adlists
59 1    * * 7   root    PATH="$PATH:/usr/local/bin/" docker exec $DOCKER_NAME pihole updateGravity > /dev/null

# Update docker-pi-hole by pulling the latest docker image ane re-creating your container.
# pihole software update commands are unsupported in docker!
30 2    * * 7   root    PATH="$PATH:/usr/local/bin/" docker exec $DOCKER_NAME pihole updatePihole > /dev/null

# Pi-hole: Flush the log daily at 00:00 so it doesn't get out of control
#          Stats will be viewable in the Web interface thanks to the cron job above
00 00   * * *   root    PATH="$PATH:/usr/local/bin/" docker exec $DOCKER_NAME pihole flush > /dev/null

Don't exactly know how to test it without waiting for when it actually executes.

Edit:

Kinda cheated and looked at the scheduled cron jobs in Webmin, but I'm not sure if it looks right.

I like Arch a lot, but it's not for everyone and I don't even use it any longer just not worth it. I use both Ubuntu and Fedora depending on what I am trying to do, both have a lot of support.

Anyways for your command line learning here is a book.

And How I feel working with Linux

@BlackHawk said:
Stuck trying to implement this cron job.

I've never actually dealt with cron, and maybe it's different with Arch and/or Cronie. Google results show people that are already knowledgeable about cron so no basic questions that I'd use are asked or answered.

I'm not sure exactly what trouble you're having but I have found the Gentoo docs have an alright treatment of cron. This may help you get started: https://wiki.gentoo.org/wiki/Cron#Scheduling_cron-jobs