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03-21-2006
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need to read a file and keep waiting till it satisfies some condition
In my script i am writing to a counter file the no of processes i had started,
that is each time i start a process, i will increment the content of counter file and also when the process ends i will decrement the content of the file. after this i do some other activities, by now i want to decide to execute further or wait till the processes i started earlier got over. So i keep reading the counter file for till content becoming zero. I am confused of writing the above part in script please help me writing a loop to keep reading the file till the contents become zero. regards, Senthil 
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03-21-2006
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Since you didn't post your OS/version or even the shell you are using OR any of the script - one can only guess that this thread will help.
Specifically: Code:
while [ $(( THREAD_CNT - 1 )) -gt 0 ]
do
update_process_status \
${RUN_ID:-0} \
${P_FN_CD} \
"InProgress" \
"staging ${FILE_TYPE} - sqlldr - threads still running: $(( THREAD_CNT - 1))" \
0
sleep 2
THREAD_CNT=$(ps -p $(print ${PID_LIST} | tr -d ' ' | nawk '{print substr($0,1,length($0)-1)}') | wc -l)
done
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