Shell Programming and Scripting

Hi,

I have two different scripts sap_ftp.sh and sap_ftp_dd.sh which are running continously in background. I am using another script called start.sh to launch these two scripts.

Either one script will process files at a time . During that time other script will sleep.. Each script will create corresponding flag file while processing files

sap_ftp.sh script checks weather sap_ftp_dd.sh flag exists or not. If flag exists this script will go to sleep for 10 secs. After that again it wakes up and checks flag exists or not, If it does not sap_ftp.sh starts processing the files by creating the flag file.

This is same for sap_ftp_dd.sh . This scritp also checks is there any (sap_ftp.sh) flag exists. If this does not exists, it will start processing files or else goes to sleep for 10 secs..

I am facing a problem while identifying the flags...

Since i am launching both the scripts through different script. Both are getting launch at a time.. Both are checking for the flags. Both are not finding any thing. Both are inserting the flags at a time and both are deleting the flags at a time.

I tried launching the second script delayed by few seconds. but that also did not worked out..

kindly help me how can i able to make scripts to identify the flag.

Thanks

From what you describe it looks like you have a race condition.

However without showing us the two scripts there is not much anybody can do to really help you figure out what is going on.

One suggestion, both your sleeps are set to 10 seconds. Change the first to 11 seconds and the second to 7 seconds.