Problem with setting up Cron in RH 7.2

[Compunuts]

I was trying to set up a cron job on my Red Hat 7.2 box.

The content is

*/5**** /home/sysadmin/getmail

But the system return the following error.

[root@supra cron.hourly]# crontab -u sysadmin -e
no crontab for sysadmin - using an empty one
crontab: installing new crontab
"/tmp/crontab.9201":1: bad day-of-month
errors in crontab file, can't install.
Do you want to retry the same edit? 
[root@supra cron.hourly]#

What am I doing wrong?? If I want a cron job to wake up and do stuff every 15 minutes, what should I do? How to set up the cron?
TIA

[cameron]

as user, what i did was make a file (i used pico)

"pico cronjob"

*/15 * * * * /program.to.run

then save it

"cron cronjob" as that same user

that should be it
the man file for cron is decent, too.... make sure you have the spaces between each asterice, the first non-spaced set is for minutes (*/15 means every fifteen minutes), the second means day (* is every day) the third is every week (* means each week) the last is month (* means every month)...i think those are right...but either way */15 * * * * means every fifteen minutes always

also, make sure that you do "cron file.name.where.you.saved.*/15 * * * *"

[Compunuts]

Ah, got it nailed down. Thanks.

"cron cronjob" as that same user

When I use that command with "cron getmail", it wouldn't work. Then I did it with crontab -e, it works fine.

make sure you have the spaces between each asterice, the first non-spaced set is for minutes (*/15 means every fifteen minutes), the second means day (* is every day) the third is every week (* means each week) the last is month (* means every month)...i think those are right...but either way */15 * * * * means every fifteen minutes always

Okay. May be because I was using artisticks without any spaces .... :-[
And thanks for your excellent explaination ...

[Killer_Penguin]

Must have spaces... spaces are our friend... without spaces,

thisisn'tveryreadablewithoutspaces...thisiswhyspac esaregood,andweneedthem.

[Compunuts]

But I can read ... :P