Add a crontab job

[hangyu]

I want to add a crontab job , and this crontab job will be run 5 times for 1 minutes ( if set "* * * * *" , it only run 1 time for 1 minute ) , what can i do ? thx

[Yogeeraj_1]

hi,

you can do it the hard way!

***** your_script; your_script; your_script; your_script; your_script;


hope this helps!

kind regards
yogeeraj

[Yogeeraj_1 · Accepted solution]

hi again,


or you can write another script so that it contains that commands 5 times inside!

vi script_run5times.sh
your_script; # run 1
your_script; # run 2
your_script; # run 3
your_script; # run 4
your_script; # run 5

then in your crontab:
***** script_run5times.sh

hope this helps too!

kind regards
yogeeraj

[hangyu]

thx reply ,

sorry , what my requirement is the crontab job run at every 20 seconds , can advise what can i do ? thx

[Senthil Prabu.S_1]

Hi,

Try this;
0,15,30,45 * * * * your script


Note:
I have not tried it on my machine.


HTH,
Prabu.S

[Senthil Prabu.S_1]

Hi,

Try this;
0,20,40,60 * * * * your script


Note:
I have not tried it on my machine.


HTH,
Prabu.S

[Yang Qin_1]

You can re-write you script or create a new script like this:

#!/usr/bin/ksh

for myrun in 1 2 3
do
orig_script &
sleep 20
done

exit

and schedule it with crontab with "* * * * *"

Yang

[Darren Prior]

Unfortunately cron can only schedule jobs on a minute by minute basis, not second by second.

You could run your script 5 times within another script with a sleep statement, but there's no guarantee that it will happen every 20 seconds.

regards,

Darren.

[Peter Nikitka]

Hi,

it is not possible to do this directly with 'cron'. If you do not want to realize this in a script by yourself (as previous posterd recommended - as well as I), do this by five corntab entries:

* * * * * /path_to/myscript
* * * * * sleep 12; /path_to/myscript
* * * * * sleep 24; /path_to/myscript
* * * * * sleep 36; /path_to/myscript
* * * * * sleep 48; /path_to/myscript

Are you shure, one instance of 'myscript' is terminated before the next is started? You'll get loads of processes 'myscript'!

mfG Peter