• toot
• systemd

Create an account to the desired instance, then login to that account with toot.

~/bin/dugbot:

#!/bin/sh
toot post -l fr -u "[email protected]" "$(fortune -sn500 dansunegalaxie)"

You will want to make sure the output of the command you give out to `toot post` isn't longer than the character limit allowed by your instance, or else it won't post.

/etc/systemd/system/dugbot.service:

[Unit]
Description=Post a random DUG quote to Mastodon
 
[Service]
Type=oneshot
ExecStart=/home/juju/bin/dugbot
User=juju

/etc/systemd/system/dugbot.timer:

[Unit]
Description=Run dugbot every 30 minutes
 
[Timer]
OnCalendar=*:00,30
 
[Install]
WantedBy=timers.target

Run it:

sudo systemctl enable dugbot.timer