HP-UX v1 shutdown command

I need some suggestions.  My office mate suggests that the best thing to use to shut down is the cmd repeat 10 sync;repeat 10 rehash;repeat 10 sync;shutdown -y.  He says he has had great luck with it.  It seems to make me wait 60 seconds for user to log-off before it will shut down.  This just 'seems' improper and I am a total novice.  Any suggestions are greatly appreciated.
verpitAsked:
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omarfaridCommented:
try to use shutdown command with time to shutdown. Please see

man shutdown
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verpitAuthor Commented:
what do

1. repeat
2. rehash
3. sync

do?

I can tell sync from the HP cmd references.  Repeat seems self-explanatory until closer examination.  Does anyone have any specific information?
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omarfaridCommented:
I think he wants you to sync (several times ) the memory content to the disks and wait enough time before shutting down
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verpitAuthor Commented:
yes, i understand that one.  what about rehash and repeat.  I don't see any hp page describing those two commands?
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omarfaridCommented:
I can't understand that as well
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omarfaridCommented:
answer was given
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verpitAuthor Commented:
sorry omar... you are correct
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