Cron won't work on Hour

[Gideon2]

Hi There my cron job won't work when I put hour

48 * * * * /home/oracle/disk

It works on minutes, but when I put 08 or 8 it doesn't run...

Running at GNU/Linux 64bit

[Miven]

My apologies, but your question doesn't make sense. What do you mean 'it works on minutes'? What works on minutes? What is 08 or 8? Show some examples of what you have tried and the errors you get. I'm still only guessing here, but what is /home/oracle/desk? Some kind of script?

Where is the file? What's it called. What else is in it? Info please.

On my system, if you want something to run daily, you put an executable script into /etc/cron.daily, but this is controlled by /etc/crontab. Mine runs everything in cron.daily at 4 in the morning, every day.

'man 5 crontab' might work here.

[Nightshadow]

I think I understand the question.
If you want to run your script at 8h, you just put this in your crontab:

0 8 * * * /home/oracle/disk

To make it run at 8h48, put this:

48 8 * * * /home/oracle/disk

[Toadbrooks]

48 * * * * /home/oracle/disk

What you have written should run every hour on the 48th minute, i.e. 00:48, 01:48, 02:48, and so on through 23:48. If it isn't running then there are two likely problems.

1) There's something wrong with /home/oracle/disk that isn't working, i.e. it is launched but errors out or
2) You don't have the cron daemon (crond) running.

As others have said, without further information it will be hard to troubleshoot your issue.

[Gideon2]

What you have written should run every hour on the 48th minute, i.e. 00:48, 01:48, 02:48, and so on through 23:48. If it isn't running then there are two likely problems.

1) There's something wrong with /home/oracle/disk that isn't working, i.e. it is launched but errors out or
2) You don't have the cron daemon (crond) running.

As others have said, without further information it will be hard to troubleshoot your issue.

The crond is running... the /disk file ran when I used only minutes, but when I add 8 or make it 48 8 * * *, it doesn't work... As per checking with the cron log, it has a RELOAD word...

The disk file runs a df command, getting the size of / and /u01...

[Gideon2]

My apologies, but your question doesn't make sense. What do you mean 'it works on minutes'? What works on minutes? What is 08 or 8? Show some examples of what you have tried and the errors you get. I'm still only guessing here, but what is /home/oracle/desk? Some kind of script?

Where is the file? What's it called. What else is in it? Info please.

On my system, if you want something to run daily, you put an executable script into /etc/cron.daily, but this is controlled by /etc/crontab. Mine runs everything in cron.daily at 4 in the morning, every day.

'man 5 crontab' might work here.

I've checked the cron.daily. There are programs that runs at 4am, can I add another line that will run a file at 3am?

[Toadbrooks]

The crond is running... the /disk file ran when I used only minutes, but when I add 8 or make it 48 8 * * *, it doesn't work... As per checking with the cron log, it has a RELOAD word...

The disk file runs a df command, getting the size of / and /u01...

OK, so you are saying that when you have this:

48 * * * * /home/oracle/disk

it works, but when you have this:

48 8 * * * /home/oracle/disk

it does not work, yes?

I don't recognize the RELOAD word you mentioned. If you can provide more context, I'll take a shot. But otherwise I can think of no reason things shouldn't work as above ... unless of course what you actually have is:

48 8 * * * * /home/oracle/disk (i.e. an extra *)

If you want to use cron.daily, you can, but I think that's only run once per day at a specific time which I think is set by crontab, so it would run at the same time as the other cron.daily commands. Personally I just use crontab for everything - saves remembering where I put an entry later.

[Gideon2]

OK, so you are saying that when you have this:

48 * * * * /home/oracle/disk

it works, but when you have this:

48 8 * * * /home/oracle/disk

it does not work, yes?

I don't recognize the RELOAD word you mentioned. If you can provide more context, I'll take a shot. But otherwise I can think of no reason things shouldn't work as above ... unless of course what you actually have is:

48 8 * * * * /home/oracle/disk (i.e. an extra *)

If you want to use cron.daily, you can, but I think that's only run once per day at a specific time which I think is set by crontab, so it would run at the same time as the other cron.daily commands. Personally I just use crontab for everything - saves remembering where I put an entry later.

Here a syntax of the reload...

Feb 13 11:01:01 [server] crond[6747]: (oracle) RELOAD (cron/oracle)

[Toadbrooks]

Here a syntax of the reload...

Feb 13 11:01:01 [server] crond[6747]: (oracle) RELOAD (cron/oracle)

All that is is the cron daemon telling you it reloaded the events you have scheduled for execution. It has nothing to do with whether the job you are asking about executed or not.