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Need info on looping

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# 1  
Old 04-04-2017
Need info on looping
My script will do:
Quote:
In infinite loop,
If file.txt has data, mail the content of it
wait for 30 minutes, repeat above step.
At the same time, keep checking if End_of_day.log is present.
If End_of_day.log present, stop infinite loop.
Code:
while true
do
	if [[ -s file.txt ]]; then
		### here im mailing content of file.txt
	fi
	
	if [[ -e End_of_day.log ]]; then
		exit 0
	fi
	
	sleep 30m
done

Quote:
In addition to mailing, Script should abend/fail, but continue the loop till End_of_day.log present
If i add exit 1 after ### mail, script is getting stopped.
Can you please suggest, how to implement above requirement. Mine is Linux machine.
# 2  
Old 04-04-2017
use break instead of exit 0
Last edited by rbatte1; 04-04-2017 at 12:28 PM..
# 3  
Old 04-04-2017
Hi,

If what you're needing to do is make sure the script does an exit 1 if it's had to send a mail, but doesn't do it until the presence of End_of_day.log, then you could amend your script like this, maybe ?

Code:
while true
do
        if [[ -s file.txt ]]; then
                ### here im mailing content of file.txt
                abend=1
        fi
        
        if [[ -e End_of_day.log ]]; then

                if [ "$abend" == "1" ]
                then
                        exit 1
                else
                        exit 0
                fi
        fi
        
        sleep 30m
done

So basically, set a variable (in this case I've called it abend) after you send the mail, and later on when it's time to exit the script check for the presence of that variable and set your exit value depending on whether or not that variable is set.

Hope this helps - if not, let us know what about this solution doesn't work and I'll have another crack at it.
# 4  
Old 04-04-2017
An alternative to remove an if ... then .... else ... fi section:-
Code:
while true
do
        if [[ -s file.txt ]]; then
                ### here im mailing content of file.txt
                abend=1
        fi
        
        if [[ -e End_of_day.log ]]; then
                exit $abend
        fi
        
        sleep 30m
done

This User Gave Thanks to rbatte1 For This Post:
drysdalk
# 5  
Old 04-04-2017
How about
Code:
until [ -e End_of_day.log ]
  do [ -s file.txt ]  && mail your stuff
     sleep 30m
  done

# 6  
Old 04-05-2017
@drysdalk, @rbatte1
Thanks for reply. I tried the code suggested, but couldn't identify that script abended after mailing.
Can you please clarfy how the script abend after mailing (but continue the loop to check for the file.txt till End_of_day.log present )
# 7  
Old 04-05-2017
Hi,

Hmm, that's odd. In the code provided, it should (in theory at least) be impossible for the script not to set an exit value of 1 on termination if it has had to send an e-mail.

You say you "couldn't identify that script abended" - how are you attempting to identify this ? No error message or warning or anything will be printed, all that will happen (in both the code I provided, and the variant suggested by rbatte1) is that the script will set its exit value to 1 if it had to send a mail at any point during its run, and will exit with 0 as normal if it didn't. You'd have to be checking its exit value to know which of those two things happened.

One last question springs to mind, just in case: what shell are you using ? I'm assuming it is Bash, since you've said you're on Linux.
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