Where is the cron for root and how to edit at start-up?

I was using Cronnix (as I am not very familiar with cron, unix etc). to create a root system task to reboot my server every night.
As I hit safe I noted I made a mistake and have it run every minute. so I do to get in any more.
So there are two solutions I can see. One is to remove the file that holds the information. in order to this I need to know where it is and I do not.
or to get in over command S at startup and change it there.
Or?
FYI I can get to the computer in T mode via an other one.
as you might imagine any help is more than welcome.

I'd go for the single-user mode startup and edit the crontab from there.
Hold Cmd-S during power up. Once the system finishes booting follow the instructions on screen to mount the root filesystem, then log in as root and run:
crontab -e
use the arrow keys to move to the offending cron entry then type:
dd
<esc>
qw!
The 'dd' deletes the current line. <esc> (the Escape key) switches to command mode and 'qw!' tells vi to quit and save the file.
From there you should be able to exit to resume normal startup.

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