OT: Cron question

alvin at Maggie.Linux-Consulting.com alvin at Maggie.Linux-Consulting.com
Fri Feb 15 19:40:15 EST 2002


hi ya

maybe i am misunderstanding...
	if days-of-month(date) < 7... than run job B
	otherwise job A

crontab -e
	...
	# 1:01am first 7 days of the month
	1 1 1-7  * * /usr/local/scripts/JobB -job dothis

	#
	# 2:15am from 8th - 31st of the month
	15 02 8-31 * * /usr/local/scripts/JobA -job somethingElse
	

have fun
alvin
http://www.Linux-Backup.net ... lots'o backup scripts ...

#
# format of fields
#
#       MIN HOUR DAY MONTH DAYOFWEEK   COMMAND
#       --- ---- --- ----- ---------   -----------
...

# Sat at 1:01am
# 1 01 * * 6    weekly backup on sat

# Sun at 2:01am
# 1 02 * * 0    full backup on su



On Sat, 16 Feb 2002, [iso-8859-1] Jakob Østergaard wrote:

> On Fri, Feb 15, 2002 at 06:15:46PM -0600, gj wrote:
> > use cron as a front to a script which uses formatted output from date to
> > 
> >   check the day of the week, if Fri
> >     check day of the month, if <=7
> >       execute job B
> >   otherwise
> >     execute job A
> > 
> > This could be implemented in Bourne shell script in a few minutes.
> > 
> > Cron doesn't really have any flow control capabilities.  Scripting is 
> > the only way to go.
> ...
> 
> Thanks - ok, several people have suggested this, and in fact I did the script
> almost immediately after the first suggestion.   Just for the record, here goes
> a script to make the Amanda backup system run one backup set every first friday
> in the month, and another set all other days.
> 
> It is assumed that cron runs the script as root, and with the arguments "check"
> early in the day (to see if the right tape is available), and "backup" later on
> for the real backup.
> 
> Use and abuse as you see fit   :)
> 
> ---------------------------8<------------------
> #!/bin/bash
> #
> # This script will either check tapes or perform
> # a backup of some particular backup set, depending
> # on the date, and on the argument given:
> #
> # argument "check" causes the script to check for tapes
> # argument "backup" causes the script to run the backup
> #
> # the first friday in the month, the script will use "FullSet"
> # on all other days it will use "DailySet"
> #
> DAILYSET="DailySet"
> FULLSET="FullSet"
> 
> # 0 is sunday, 0-6
> DAYOFWEEK=`date +%w`
> 
> # 1-31
> DAYOFMONTH=`date +%d`
> 
> # Is this a friday ?
> if [ $DAYOFWEEK -eq 5 ]; then
> 	# Is this the first week of the month ?
> 	if [ $DAYOFMONTH -lt 8 ]; then
> 		USESET=$FULLSET
> 	else
> 		USESET=$DAILYSET
> 	fi
> else
> 	USESET=$DAILYSET
> fi
> 
> # Check args
> case "$1" in
>   check)
>     COMMAND="/usr/sbin/amcheck -m $USESET"
>         ;;
>   backup)
>     COMMAND="/usr/sbin/amdump $USESET && (/usr/sbin/amverify $USESET &> /dev/null)"
>         ;;
>   test)
>     COMMAND="echo \"Will run backup set \\\"$USESET\\\"\""
>         ;;
>   *)
>     echo "Must use either check, backup, or test as argument"
>     exit 1
> esac
> 
> # echo "$COMMAND"
> su amanda -c "$COMMAND"
> ---------------------------8<------------------
> 
> 
> -- 
> ................................................................
> :   jakob at unthought.net   : And I see the elder races,         :
> :.........................: putrid forms of man                :
> :   Jakob Østergaard      : See him rise and claim the earth,  :
> :        OZ9ABN           : his downfall is at hand.           :
> :.........................:............{Konkhra}...............:
> _______________________________________________
> Beowulf mailing list, Beowulf at beowulf.org
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> 

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