This is a D-Bus daemon (pissd) and client (piss-level) that monitor the international
space station's urine tank level.
I have it integrated into my status bar (X version):
#...
function piss {
PISS_LEVEL="$(piss-level)";
if [ -n "$PISS_LEVEL" ]; then
echo " ${PISS_LEVEL}%";
fi;
}
#...
while true; do
xsetroot -name "$(piss)$(batt)$(datetime)";
sleep 1;
done;
I made this pretty much entirely so that I could call a program "piss daemon".