Shell Programming and Scripting

Does the file you are using as a kind of semaphore original on the same server as the script you are running, or does it originate on a different server?

Minor revision to methyl's script

Code:

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

My source system sends a dummy file on to my server on a specified path.
My work is to .. wait for the file
delete it once i find it
and start b.sh script.

am deleting the file so that i should again wait for the file to arrive tomorrow from source

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 ?

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.

Instead of using a file as a signal, why not use a signal and have one file send a signal to the other file?

For example, see this site search result:

https://www.unix.com/cfmgoogle.php?cx...sa=Search#1077

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 ..