Run shell script as a daemon


 
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# 1  
Old 05-16-2007
Run shell script as a daemon

I have simple shell script that I run as cron job every hour of the day. I would like to make it a daemon that runs far more frequently like every 30 seconds or so, but I have never made daemon before. How can I do this?

-Sam
# 2  
Old 05-16-2007
Sam,
Use "cron".
In unix, do a man page to it:
man cron
# 3  
Old 05-16-2007
Sure,

I would like to keep using cron, but will I be able to run a cron job say every minute at least. I was always under the impression that running a cron job in intervals under 5 minutes was not the best practice. Please advise because I could really be wrong.
# 4  
Old 05-16-2007
Or use something like this:

Code:
while :;do
	# your code here
	sleep 30
done

# 5  
Old 05-16-2007
Should I insert that example code into my java program or add it to my shell script which runs the java program?
# 6  
Old 05-16-2007
This is shell syntax so you cannot put it in your java code.
If you know java - write it all in java, if not - write a shell wrapper.
# 7  
Old 05-16-2007
Quote:
Originally Posted by Sammy_T
Sure,

I would like to keep using cron, but will I be able to run a cron job say every minute at least. I was always under the impression that running a cron job in intervals under 5 minutes was not the best practice. Please advise because I could really be wrong.
Having any program wake up after only a few seconds and do something is bad-practice. It is far better for a program to wake up as a result of a specific event (signal, file descriptor read, semaphore etc).

If you really must then kick it down in priority with nice.
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