Cron jobs

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Operating Systems HP-UX Cron jobs
# 1  
Old 10-12-2007
Cron jobs

i am new for cronjobs

can someone please tell me what logic is behind these RED Numbers and stars below?

--> crontab -l
00 1 * * * /home/scripts/TarprodContent > /tmp/MprodBkup.log 2>&1
00 1 * * * /home/scripts/TarTprodContent > /tmp/TprodBkup.log 2>&1
00 1 * * * /home/scripts/TarTdprodContent > /tmp/TdprodBkup.log 2>&1
00 1 * * * /home/scripts/TTprodContent > /tmp/TTprodBkup.log 2>&1
00 1 * * * /home/scripts/TDprodContent > /tmp/DprodBkup.log 2>&1
00 1 * * * /home/scripts/TSprodContent > /tmp/SprodBkup.log 2>&1
0,15,30,45 5-22 * * * /home/scripts/VerifyDocbasesUp > /tmp/check_docbase_connectivity 2>&1

thanks in advance
# 2  
Old 10-12-2007
'man crontab' should be a good starting point!
# 3  
Old 10-12-2007

The red numbers and * tell cron when to run your job. It is broken up like this.

# +---------------- minute (0 - 59)
# | +------------- hour (0 - 23)
# | | +---------- day of month (1 - 31)
# | | | +------- month (1 - 12)
# | | | | +---- day of week (0 - 7) (Sunday=0 or 7)
# | | | | |
* * * * * command to be executed

so the first command is the minute the second is hour, day of month, month, day of week.

A * means run at every time increments. Therefore if they are all *'s the cronjob would run every minute of every hour of every day of every month of every day of year.

Add cronjobs by using crontab -e and view cronjobs by using crontab -l.


0 12 * * * /tmp/buffer/

this would run at noon of every day of every month of every day of week.
# 4  
Old 10-12-2007
thanks for your quick reply
# 5  
Old 10-13-2007

Very nicely done.. explains it in really simple format which i believe everyone should be able to follow

# 6  
Old 10-15-2007
oh yes...thats right. its nicely described.

thanks again
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