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Full Discussion: Cron job shell script..
Top Forums Shell Programming and Scripting Cron job shell script.. Post 302342195 by edfair on Friday 7th of August 2009 07:37:33 PM
Old 08-07-2009
cron doesn't care how many times you invoke the same script file. So why not invoke it 16 times at the time you want it to run?

0 0 * * * * /usr/bin/cleanup
30 1 * * * * /usr/bin/cleanup
0 3 * * * * /usr/bin/cleanup
.
.
.
30 22 * * * * /usr/bin/cleanup

Without doing some research, and assuming that the SCO I'm familiar with might work differently, I would suspect that the 90 minute sequence of executing might be determined by the time of the last reboot.
 

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UUPOLL(8)						      System Manager's Manual							 UUPOLL(8)

NAME
uupoll - poll a remote UUCP site SYNOPSIS
uupoll [ -ggrade ] [ -n ] system DESCRIPTION
Uupoll is used to force a poll of a remote system. It queues a null job for the remote system and then invokes uucico(8). The following options are available: -ggrade Only send jobs of grade grade or higher on this call. -n Queue the null job, but do not invoke uucico. Uupoll is usually run by cron(5) or by a user who wants to hurry a job along. A typical entry in crontab could be: 0 0,8,16 * * * /usr/bin/uupoll ihnp4 0 4,12,20 * * * /usr/bin/uupoll ucbvax This will poll ihnp4 at midnight, 0800, and 1600, and ucbvax at 0400, noon, and 2000. If the local machine is already running uucico every hour and has a limited number of outgoing modems, a more elegant approach might be: 0 0,8,16 * * * /usr/bin/uupoll -n ihnp4 0 4,12,20 * * * /usr/bin/uupoll -n ucbvax 5 * * * * /usr/sbin/uucico -r1 This will queue null jobs for the remote sites at the top of hour; they will be processed by uucico when it runs five minutes later. FILES
/etc/uucp/ UUCP internal files /usr/spool/uucp/ Spool directory SEE ALSO
uucp(1), uux(1), uucico(8) 4.3 Berkeley Distribution October 23, 1996 UUPOLL(8)
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