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Full Discussion: Cron job randomly once a day
Top Forums Shell Programming and Scripting Cron job randomly once a day Post 302467901 by Neo on Monday 1st of November 2010 12:38:06 AM
Old 11-01-2010
You can simply generate a random number each day (with one crontab file that runs only once at the beginning of the day) that corresponds to the number of minutes (or 5 minute intervals) each day, and write that number to a file.

Then, you have a second crontab file that reads the random number in the file and checks against the time and executes if there is match.

If you are using PHP, you can also try to use PHP shared memory, or you could use an environmental variable to hold the daily random number. There are many ways to do this.

---------- Post updated at 04:38 ---------- Previous update was at 04:34 ----------

Quote:
Originally Posted by ctsgnb
maybe use the "at" command instead ?
While it is possible to set something up with the at command, the original poster asked for a crontab solution.

This is easily done with cron, as requested by the original poster.

(See my post above)
 

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LEARN ABOUT OPENDARWIN

sa1

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

     sa2(8), sadc(8), sar(1), iostat(8), vm_stat(1), netstat(1), top(1), sc_usage(1), fs_usage(1), crontab(1), crontab(5)

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