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how to check if a new line has been added to a file?

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Top Forums Shell Programming and Scripting how to check if a new line has been added to a file?
# 1  
Old 03-26-2009
how to check if a new line has been added to a file?
Have come up with the following but it doesn't seem to work.. Is there some other command i could use to get this to work?

Code:
OUTPATH=/home/out
PARMFILE=$OUTPATH/jobcount_test.txt
LOG=$OUTPATH/job_count_monthlymail_log.txt
HLOG=$OUTPATH/job_count_monthlymail_hlog.txt
#
echo " started at $(date)" > $LOG
#
integer count=0
while [[ $count < 2 ]]
do
   body_msg=`tail -1 $PARMFILE`
   mailx -s "$body_msg" jarrathy@notes < $body_msg
   ((count = count +1))

done
##
echo " ended at $(date)" >> $LOG
cat $LOG >> $HLOG

I was updating the jobcount_test.txt and was hoping when i entered in a new line that the script would mail out that line and that when I had two lines in there the job would stop but it didn't.. can someone tell me what i'm doing wrong?
# 2  
Old 03-26-2009
Hi,
i m not sure exactly what you want..suppose if you want to know only when there is new line comes in your log ...then below will work...

i did small change in your script..

Code:
OUTPATH=/home/out
PARMFILE=$OUTPATH/jobcount_test.txt
LOG=$OUTPATH/job_count_monthlymail_log.txt
HLOG=$OUTPATH/job_count_monthlymail_hlog.txt
#
echo " started at $(date)" > $LOG
#
Linecount=`wc -l $PARMFILE|awk '{print $2}'`

while [[ $Linecount -le 2 ]]
do
   body_msg=`tail -1 $PARMFILE`
   mailx -s "$body_msg" jarrathy@notes < $body_msg
done
##
echo " ended at $(date)" >> $LOG
cat $LOG >> $HLOG

Thanks
SHa
Last edited by Franklin52; 03-26-2009 at 08:34 AM.. Reason: adding code tags
# 3  
Old 03-26-2009
Completely forgot about line counts... Thanks for that..

trying to set up a script that will keep running until a certain amount of lines are expected in the file, while also emailing out each new line that comes into that file

Tried what you suggested.. My while loop didn't like -le so changed it to < (using ksh so not sure if thats why -le didn't work)
Ran the script again and it didn't work.. Loop didn't exit out when i put two lines into the file.

Not sure where to go from here
Last edited by Jazmania; 03-26-2009 at 09:12 AM..
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