station_cnt not work ?

Hi ! I'm French and I want make a Piratebox for my boarding School and i want see who is connected on my Piratebox but when i want enable Station_cnt i have a problem :/

When i activate station_cnt it's ok

[root@alarmpi alarm]# /opt/piratebox/bin/install_piratebox.sh /opt/piratebox/conf/piratebox.conf station_cnt
installed, now every 2 minutes your station count is refreshed

but when i want to do this command, it does not work :/
[root@alarmpi alarm]# /etc/init.d/cron enable && /etc/init.d/cron start
bash: /etc/init.d/cron: No such file or directory

I don't have a folder init.d in /etc/
Where is a cron ? Help me please


Thanks for your attention :)