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Which is more efficient - sleep or infinite while?

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# 1  
Old 08-20-2008
Which is more efficient - sleep or infinite while?
Hi
i need to make a script to check disk space every hour.

****Note that cron is not allowed.

So i need to use either sleep or while 1 ...pls suggest which is more efficient in this scenario?

And is there any other way to do the task?

Thanks,
Ashish
# 2  
Old 08-20-2008
The most efficient and simple way is while and sleep.

Code:
while [ 1 ]
do
    your_stuff...
    sleep 3600
done

# 3  
Old 08-20-2008
Quote:
Originally Posted by redoubtable
The most efficient and simple way is while and sleep.

Code:
while [ 1 ]
do
    your_stuff...
    sleep 3600
done

Hi thanks for reply ..
if i use sleep with goto ..will that be moe effiecient as comapred to while 1?

Also what are drawbacks of sleep and while 1.
# 4  
Old 08-20-2008
I would say that's pretty much the same thing (while and goto) but for the sake of simplicity I would advise you go use while.

There are no drawbacks in sleep and while 1. It does it's job and then simply does nothing for 3600 seconds.
# 5  
Old 08-21-2008
actaully, as i have recently learned, [ 1 ] is not the best way

Code:
while :
do
     some stuff
     sleep 11101
done

# 6  
Old 08-21-2008
Quote:
Originally Posted by broli
actaully, as i have recently learned, [ 1 ] is not the best way

Code:
while :
do
     some stuff
     sleep 11101
done

I always use
while : ; do
myself and I would never use
while [ 1 ] ; do
but I wonder why you object to it. I object to it because it is a terribly misleading construct:
Code:
$ [ 1 ] && echo yes
yes
$ [ 0 ] && echo yes
yes
$ [ xyzzy ] && echo yes
yes
$

Few people expect all 3 of those to behave the same. But assuming that : and [ are both shell built-in commands, they should be about as fast.
# 7  
Old 08-21-2008
you wanna know the draw back of sleep??
try running
timex sleep 60
it will give any idea..
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