Cron schedule for ever other week

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# 1  
Old 07-23-2009
Cron schedule for ever other week

I have cron scheduing that after hotbackup omniback kicks in and back up tape.

00 17 * * * /usr/local/bin/archbakPRD/ > /usr/local/bin/archbakPRD/dbfcopy.log 2 >&1

above cron can fired every night at 5PM but omnibackup need to have seperate name for each backup ( i.e: PRD_backup_Mon_A, PRD_backup_Tue_A, etc )

Above is not a problem since all I have to do is

00 17 * * 1, 00 17 * * 2, 00 17 * * 3, 00 17 * * 4, etc with different day hardcoded in backp script.

Now My problem

we have two set of tape drive and rotate tapes inside. For example

1st and 3rd Monday we use PRD_backup_Mon_A

2nd and 4th Monday we use PRD_backup_Mon_B

I know I can create 8 set of cron schedule but how do I go about setting up the cron so that it will run every other Monday for "PRD_backup_Mon_A" and every other Monday for "PRD_backup_Mon_B"?

any help will be appreciated

# 2  
Old 07-23-2009

Sadly, cron doesn't work in weeks, only days of the week and days of the month.

Perhaps you could have a single cronjob running every monday and make a minor change to your script?

Besides, you might have 5 Monday's in a month. Then what?

Crude example:
if [ -r next_backup_is_B ]; then
  set tape device to "PRD_backup_Mon_B"
  rm next_backup_is_B
  set tape device to "PRD_backup_Mon_A"
  touch next_backup_is_B
(the rest of you script...)

Failing that perhaps more "intelligent" scheduling software could be used.
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