First, create a shell script to generate the output and send it to the console.
mkdir /etc/scripts
cat << EOF > /etc/scripts/ctrl-alt-del.sh
#!/bin/sh
/bin/echo "" > /dev/console
/bin/echo "Nope. This isn't Windoze." > /dev/console
EOF
Next, create the two systemd files.
rm -f /lib/systemd/system/ctrl-alt-del.target
rm -f /lib/systemd/system/ctrl-alt-del.service
cat << EOF > /lib/systemd/system/ctrl-alt-del.target
[Unit]
DefaultDependencies=no
Description=Ctrl-Alt-Del
Requires=ctrl-alt-del.service
StopWhenUneeded=yes
EOF
cat << EOF > /lib/systemd/system/ctrl-alt-del.service
[Service]
DefaultDependencies=no
Type=oneshot
ExecStart=/etc/scripts/ctrl-alt-del.sh
EOF
Finally, reload the systemd daemon.
systemctl daemon-reload
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