Crontab Entry to run every 45 Minutes

[kozlow]

I am trying to schedule a job to run every 45Minutes but am at a loss on how to accomplish.

Any ideas?

 

[lpblauen]

do a crontab -e

45 * * * * /usr/bin/whatever >/dev/null 2>&1

Thats minutes hours dayofmonth month weekday command

 

[kozlow]

That is 45 past the hour --- Every 60Minutes......

In the mean time, I am going to run every 40 Minutes

Even Hour - 0,40
Odd Hour - 20

 

[MadMichael]

Your cron pattern will look like this:

00,45 0,3,6,9,12,15,18,21 * * *
30 1,4,7,10,13,16,19,22 * * *
15 2,5,8,11,14,17,20,23 * * *

If you plot out the 45-minute intervals, you will see that the minutes-after-the-hour repeats every three hours.

00:00
00:45
01:30
02:15
03:00
03:45
04:30
05:15
06:00
...and so on...

 

[mrn]

Like I said in the AIX forum (where you posted the same question)

enter the following on the command line

echo 0 > /tmp/count

use vi to create the following script

vi 45min.ksh

count=`cat /tmp/count`

if [ $count = "3" ] ; do
whatever_command
((count += 1))
echo $count > /tmp/count
done

if [ $count = "3" ] ; do
echo 0 > /tmp/count
done
fi

Then run this every 15 minutes from cron

00,15,30,45 9-17 * * * 45min.ksh

Mike

"A foolproof method for sculpting an elephant: first, get a huge block of marble, then you chip away everything that doesn't look like an elephant."

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