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Shell Programming and Scripting

event or file wait scenario

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# 1  
Old 02-09-2009
event or file wait scenario
i want to do 2 things

1) i should wait for a file called A.txt to fall on a specific path on the server
2) once the file arrives immediately another script called B.sh should be executed.

Could you please throw somelight on this.
Any code if already present that would be helpful.

Regards
Rajesh
# 2  
Old 02-09-2009
How large is A.txt? It can "appear" on the host before all of the data has been written. If you "immediately" run another script, you risk affecting a change to a partial file...
# 3  
Old 02-09-2009
hi
hi

A.txt is just an indicator /dummy file... am waiting for this file just to make sure that this is the time ... that i should run b.sh script
# 4  
Old 02-09-2009
One way is to sit in a sleep loop.

Code:
while true
do
        if [ -f A.txt ]
        then
                sleep 10
        else
                break
        fi
done
b.sh


avronius is right. Unless the file is a simple flag created with something like "touch" it could be not ready for processing.
# 5  
Old 02-09-2009
This link might help you a bit:
https://www.unix.com/shell-programmin...#post302272463

Have the script check for the existence of the file that you are referring to - if it finds the file, do stuff...

- Avron
# 6  
Old 02-09-2009
event wait throu unix
hi

thanks for your response.. i have gone through your link but i would like to explain my case once again

I have a script called B.sh
Its not scheduled to run at any specific time.

Now..

I receive a file A.dat at a specified location daily.

Once i see the file ... i should remove it and then B.sh should start

This should happen daily .
# 7  
Old 02-09-2009
Yes the file is a touch file
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