11-27-2009
Shell script to generate daily crontab entries between to specific dates
Hi,
I am currently writing a shell script to enter daily reoccurring jobs into the crontab. I want to be able to specify any two dates for which I want these daily jobs to run between.
Below is an example of what I need to be written to crontab.
# Give a start day of 21/10/2009 09:00 and end day of 23/10/2009 09:00, we need the following crontab entries:
# 00 09 22 10 0-7 script.sh 10/21/2009 10/22/2009
# 00 09 23 10 0-7 script.sh 10/22/2009 10/23/2009
Currently, I am assuming that the two date span within a month, but I want to extend this so that the dates can span across any time frame.
How would I go about running through all the days between 2 particular dates?
Any help would be much appreciated.
Thanks,
Jess
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sa1(8) BSD System Manager's Manual sa1(8)
NAME
sa1 -- Generate a system activity daily data file.
SYNOPSIS
/usr/lib/sa/sa1 [t n]
DESCRIPTION
The sa1 command is a shell script used to invoke the system activity data collector, sadc. The binary sample data is collected at intervals
t seconds apart, in a loop n times. The binary sample data is written to the standard daily data file, /var/log/sa/sadd where the dd repre-
sents the current day of the month.
sa1 is intended to be started by cron.
EXAMPLE CRON ENTRY
# Starting at 8am collect system activity records
# every 20 minutes for 12 hours
# 20 minutes = 1200 seconds
# 12 hours with 3 samples each hour = 36 loops
0 8 * * 1-5 /usr/lib/sa/sa1 1200 36
# After the 12 hour period,
# collect a system activity report
30 20 * * 1-5 /usr/lib/sa/sa2 -A
FILES
/var/log/sa/sadd Default daily activity file that holds the binary sampling data. dd are digits that represent the day of the month.
SEE ALSO
crontab(1), fs_usage(1), netstat(1), sar(1), sc_usage(1), top(1), vm_stat(1), crontab(5), iostat(8), sa2(8), sadc(8)
Mac OS X Jul 25 2003 Mac OS X