I schedules some jobs using at command of dos.
When I type at, it shows meL

C:\Documents and Settings\admin_Pmehrotr>at
Status ID Day Time Command Line
1 Each M T W Th F S Su 12:00 PM cmd.exe /C
uct\10.1.0\admin\itgdev\scripts\myaddon\expdp.bat >>

Now when I want to delete this job:

at 1 /delete

I get a message job id does not exist, why? How I can remove a job so
it does not run through the scheduler.