On 09.01.2012 12:33, Alan McKinnon wrote: > On Mon, 09 Jan 2012 13:10:50 +0100 > Daniel Troeder <[email protected]> wrote: > >> Hi :) >> >> It seems I don't understand something about cron(tab). Can someone >> help me pls: >> >> I want to run flexbackup with the following backup plan: >> * monthly full >> * weekly diff >> * daily incr >> >> So I have installed sys-process/vixie-cron-4.1-r12 (and virtual/cron-0 >> and sys-process/cronbase-0.3.3). >> >> My crontab (created with "crontab -e") contains: >> >> 00 03 2-31 * 1-6 /usr/bin/flexbackup -set root -level incremental >> 00 03 2-31 * 0 /usr/bin/flexbackup -set root -level differential >> 00 03 1 * * /usr/bin/flexbackup -set root -level full >> >> The problem I'm facing is, that incr and diff are executed each day >> _both_ at the same time (which flexbackup luckily handles well). >> >> From my understanding the 2nd line (diff) should only be run on >> sundays, and the 1st line (inc) should not run sundays. >> >> >> Can someone please explain me what I'm doing wrong? > > You are combining fields 3 and 5, those two work funny. > > Unlike the other datetime specs, they are not ANDed, they are ORed. > > Taking the first one, you obviously want the cron to run at 3 am > between the 2nd and 31st of the month AND if the day is Mon-Sat. > > What it is doing is running at 3am every day between the 2nd and 31st > and also every day Mon-Sat (even if that is the 1st of the month). > > Vixie cron does not directly allow you to do what you want. It's > designed to run things periodically on a set schedule and doesn't do > "except" very well. > > A better approach would be to fire off a wrapper script every day at > 3am. This script will then check for date, time and day of week and > launch the app with the appropriate options. Thank you for the explanation! Unfortunately that it's ORd :( ....
So I wrote this:
### /etc/cron.daily/run_flexbackup ###
#!/bin/bash
DOM=$(date +%d)
DOW=$(date +%w)
function run_backup() {
# do some stuff
/usr/bin/flexbackup -set root -level $1
# do more stuff
}
if [ $DOM = 1 ]; then
run_backup full
else
if [ $DOW = 0 ]; then
run_backup differential
else
run_backup incremental
fi
fi
Bye,
Daniel
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