I just tried a simple thing - to display time on the terminal every 5 minutes .. this is my crontab entry for it - but it doesnt seem to work ... y is that?

pwd
/usr/lib

contab -e
no crontab for root - using an empty one
crontab: installing new crontab

crontab -l
0,5,10,15,20 * * * * (echo -n ' '; date; echo " ") > /dev/console