topic Re: Crontab Time Setting question in Operating System - Linux

Crontab Time Setting question

Jorge Cocomess — Wed, 27 Jun 2007 13:20:06 GMT

I can't seem to figure out the correct syntax for setting this cron job with specific time.

I would like to run this particular job at these time slots:

6:30
10:15
13:15
16:00
19:15

This is how I have it setup and working, but I can't figure out what to do with the one with 15 minutes job.

30 6,10,13,16,19 * * * /tmp/My_File

Please help.

Thank you in advance.

Jorge

Re: Crontab Time Setting question

Steven E. Protter — Wed, 27 Jun 2007 13:30:30 GMT

Shalom

30 6 * * * /tmp/My_File
15 10 * * * /tmp/My_File
15 13 * * * /tmp/My_File
00 16 * * * /tmp/My_File
15 19 * * * /tmp/My_File

There is no way to do this with one line in cron. If there is a way to do it on one line with Linux, its not supported off platform and I would not do it because I want my cron schedules portable with HP-UX, AIX and Solaris.

SEP

Re: Crontab Time Setting question

IT_2007 — Wed, 27 Jun 2007 13:32:15 GMT

your settings performs for every hour with min. as 30, 6, 10, 13, 16 and 19.

crontab isn't user friendly. You may have to setup multiple cron jobs to run at specific times since these timings are not in sequence.

1 - min.
2 - hour
3 - weekday

if you want to setup cron job which runs every 15min, then do this

0, 15, 30, 45, 60 * * * /tmp/my_file >/dev/null

Re: Crontab Time Setting question

Ivan Ferreira — Wed, 27 Jun 2007 13:33:09 GMT

You need to create three jobs:

# At 16:00
0 16 * * * /tmp/My_File
# At 6:30
30 6 * * * /tmp/My_File
# At 10:15, 13:15, 19:15
15 10,1319 * * * /tmp/My_File

Re: Crontab Time Setting question

IT_2007 — Wed, 27 Jun 2007 13:35:59 GMT

sorry. you have to setup 2 cron jobs to align with correct hour and min.

setup another cron job for 10:15, 13:15 and 19:15 timings.

15 10, 15 13, 15 19 * * * /tmp/myfile >/dev/null

Re: Crontab Time Setting question

Jorge Cocomess — Wed, 27 Jun 2007 15:36:41 GMT

Got it!! No wonder I couldn't find it.

Thank you so much!!

Jorge