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How to write a daemon in Unix?


 
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# 1  
Old 10-24-2006
How to write a daemon in Unix?

Hi

I have a directory where sometimes a file will come (in a name format say file001.txt).
I want to run a job (.ksh file) as soon as a new file comes into the directory.

How can I write a shell script which will run in the background and monitor arrival of new file in the directory?

Thanks in advance.
# 2  
Old 10-24-2006
Look in to cron jobs, you can write a script to monitor files, depending on what you to do. Put this script in a cronjob, the cron will wake up run the script. The cron wakes up once every minute, and looks for jobs to run.

HTH,

Nitin
# 3  
Old 10-24-2006
Here's a brute force method using ksh:
Code:
while true; do
  if [[ -s file001.txt ]]; then
    # Found the file; do stuff here
    print "found file!"
    break # stop the loop
  fi
done

The loop cycles forever, checking whether the file exists, and stops checking once found. You may want to consider the relative effect (if any) of having a script running constantly like this. A cron job that runs every minute might be a better choice, depending on your requirements.
# 4  
Old 10-25-2006
i would suggest the above script with a sleep interval in between for every check.
# 5  
Old 04-18-2008
Kpit

HI Glenn i tired this code it gives me an error "Can't find file" & still echoes the output desired, i would also like to add sleep intervals within the loop can you explain or send the code to achieve that
# 6  
Old 04-18-2008
time intervals for the script

Hi all,Matrix,Glenn
can you help me in setting a script which checks for a file within every 10 mins,...script should have time intervals in between
below code checks the file but gives an error msg cant find file & then again prints the output found file

Code:
while true; do
if [[ -e file001.txt ]]; then
# Found the file; do stuff here
print "found file!"
break # stop the loop
fi
done


Last edited by Yogesh Sawant; 04-21-2008 at 06:35 AM.. Reason: added code tags
# 7  
Old 04-18-2008
this should have been a new thread Smilie

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