Only because I keep looking for it here, and haven't (apparently) posted it yet, here's how to get neofetch to display at boot on various operating systems:
CentOS/openSUSE/SLES: echo "neofetch" >> /etc/profile.d/motd.sh
Ubuntu/Slackware: sudo bash -c $'echo "neofetch" >> /etc/profile.d/neofetch_motd.sh && chmod +x /etc/profile.d/neofetch_motd.
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