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 .

Minor revision to methyl's script

while true
do
        if [ -f A.txt ]
        then
           # If the file exists, run b.sh
           b.sh
           exit 0
        else
           # If the file does not exist wait a small increment of time
           sleep 10
        fi
done

H avronius

i think we are getting close.. but my doubt is

say we did not get the file it goes executes sleep10 .. wat next after 10 seconds?

and should i write this< if code i>n another a.dat file and schedule it using cron to run continously ?

Hi all with your help I think we got the solution

1. Create a file First.dat with the following code mentioned by avronius and methyl's

while true
do
if [ -f A.txt ] -- checks if A.txt file arrived or not
then
# If the file exists, delete A.txt and run b.sh
rm A.txt
b.sh
exit 0
else
# If the file does not exist wait a small increment of time
sleep 10
fi
done

2. Schedule First.dat to run for every minute

Actions:

Once it finds A.dat then If condition is satisfied and b.sh will run and program breaks.

and it waits for the file for tomorrow again .. the same way

sincere Thanks for all of you ..

Why don't you test it and see what happens?

I tested by running the script without A.txt
I waited about 15 seconds - of course, nothing happened
I put the command to sleep, I touched A.txt
I brought the command back to the foreground
It immediately discovered that A.txt was there - and reported that the condition was met.

In it's current state, it will run once - and keep waiting for the file to appear. Once the file appears, it will do whatever is in the "then" part of the loop. It will then stop running.