cron, run at yyyy-mm-dd hh:ii:SS?
 

Hey, so I've searched these forums, and google, but all I find is how to run a script every 5 seconds, or something like that. But that is not what I'm looking to do.

Say I want to launch a command at 2009-11-30 at 21:04:22 (yes, with seconds). How would I go about to launch this, as cron doesn't take seconds.
I've read about making scripts that loops every 1 second or so, but I'm not sure of how to do that.


What I would like to do is make a php-script that adds dates+times to launch specific command into cron?

Hope you understand what I mean. Any help appreciated.

-p

Maybe this should work, (for 2009-11-30 at 21:04:22 as in OP)

in cron:


or

and in runthis.php

Maybe you should use at for that.

Hello, and thanks for your reply.

I didn't know about that command :redface:

I tried this:
but got:
how's the syntax supposed to be?

Please :)

man at

well it didn't make any sense.

It said i should be able to type something like MMDDYY or HH:MM.

I didn't get it to work cause there was nothing there explaining the syntax. I tried:

at MMDDYY HH:MM
but that didn't work.. but I should have used:

at HH:MM MMDDYY
which seems to work.



But there are still no seconds in At? just like cron :(

The cron + sleep 22 seconds is prob going to be the easiest. Note that cron is used when you want a process to run repeatedly over time. at is for one shot processes.

As per the man pages
http://linux.die.net/man/1/at
http://linux.die.net/man/5/crontab

you can only specify a starting time to the nearest minute.

FYI one can not be absolutely sure that a job will start at precisely 00 seconds. In addition jobs are executed in a top down fashion so the order of tasks in the crontab file will be important if you have multiple jobs that run at the same minute.

Thank you all for your replies. I have gotten so far now that I am executing

php /var/www/test.php | at -t 200911262230

the problem with this is that it runs the command when I hit Enter, not when it reaches 2009-11-26 22:30.

What am I doing wrong here?

never mind that last post, i just got

echo "ls -li" | at -t 200911262228

to work.. I will do some more testing.

this is really weird..


first: dummy.php
this command:
when I hit enter after entering the above, it will take 10 seconds before i get back to prompt, which means it does the sleep(10) from the php-script directly? Or am I missing something? Is it supposed to act like this?

acts in the same manner by the way. Sleeps 10, then showing that the command was added to at.

so, doing it like this:

is giving me the result I'm expecting. So I guess it's some error in my syntax when I try to do all this in 1 line.

Can someone point me in the right direction here, cause I'm lost.
/usr/bin/php /var/www/dummy.php 10 | at -t 200911262336

is not working.

Because you're tying to feed the output of the the command to at.
What you WANT to do is:


Cheers,
Tink

Thank you so much Tink, this works.