/lib/systemd/system-sleep/tuxonice is in tuxonice-userui 1.1+dfsg1.gc3bdd83-3+b1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/sh
[ "$1" != pre ] || case "$2" in hibernate|hybrid-sleep)
if cd /sys/power/tuxonice 2>/dev/null; then
shift
TUXONICE_USERUI_PROGRAM="/usr/lib/tuxonice-userui/tuxoniceui -v63"
[ -f /etc/tuxonice.conf ] && . /etc/tuxonice.conf
echo "$TUXONICE_USERUI_PROGRAM" >user_interface/program
fi ;;
esac
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