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loop script

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loop script UNIX Help forum discussing the Unix Operating System and all variants including Irix, Solarix, and AIX. Unix was designed as a true multi-user operating system.

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  #1  
Old December 20th, 2004, 06:55 AM
SysAd_babe SysAd_babe is offline
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Question loop script
Hi,

I have to create a shell script that will loop every 5minutes and will check if file.txt exists. If file.txt exists, it will call another shell script to execute. Kindly help me, what looping technique should i use.

Thanx.
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  #2  
Old December 20th, 2004, 07:00 AM
fpmurphy fpmurphy is offline
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Using pseudocode:

Code:
    while TRUE
    do
          check file status & do something if condition meet
          sleep 360 seconds
    done
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Old December 20th, 2004, 07:35 AM
SysAd_babe SysAd_babe is offline
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does this also apply in unix shell script?

Thanks
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  #4  
Old December 20th, 2004, 12:35 PM
Perderabo Perderabo is offline
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The potential trouble with fpmurphy's technique is that "something" might not consume the file. So we stay in the loop, sleep again, and do "something" again. This may be what is needed. Or we might want to do "something" just once:
Code:
while FILE DOES NOT EXIST
do
        sleep 300
done
run second script
exit

And again this is psuedo-code to simply illustrate the looping technique. It applies to all languages incuding most shells. Specific syntax is not possible since there are many languages including several shells.
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Old December 21st, 2004, 02:15 AM
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Thanx so much
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Old December 22nd, 2004, 07:52 AM
guggach guggach is offline
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The potential trouble with perderabo's technique is that
it will run once (if the second does not (re)call the first script)
is this the Q ?
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