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help with a shell script that greps an error from the logs

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Top Forums Shell Programming and Scripting help with a shell script that greps an error from the logs
# 1  
Old 10-05-2010
help with a shell script that greps an error from the logs
Hello everyone.
I wrote the following script but the second part is not excecuting. It is not sending the notification by email if the error occurs.
the send mail is working so i think the errorr should be in the if statement
Code:
LOGDIR=/logs/out
LOG=`date "+%Y%m%d"`.LOG-FILE.out #the log file 
TEMPDIR=/logs/out/test
DATE=`date +"%d-%m-%Y"`
TIME=`date +"%H:%M:%S"`
CUR_SIZE=`wc -l $LOGDIR/$LOG | awk '{print $1}'`
PREV_SIZE=`cat $TEMPDIR/log.size`
if [ $CUR_SIZE -eq $PREV_SIZE ]
then
echo " Nothing to do..."
> $TEMPDIR/log.diff
fi
if [ $CUR_SIZE -gt $PREV_SIZE ]
then
let STSIZE=$PREV_SIZE+1
sed -n "$STSIZE,$CUR_SIZE p" $LOGDIR/$LOG > $TEMPDIR/log.diff
grep 'the message i want to grep from logs' $TEMPDIR/log.diff> $TEMPDIR/log.alarm
if [ `cat $TEMPDIR/log.alarm |wc -l` -gt 0 ]
then
/usr/sbin/sendmail -f ... -t my email address < $TEMPDIR/log.alarm
fi
fi
echo $CUR_SIZE > $TEMPDIR/log.size

Last edited by vbe; 10-05-2010 at 06:56 AM.. Reason: code tags please
# 2  
Old 10-05-2010
Is this how we should read the code? ( I just done a bit of formatting to ease the reading, and be sure we agree on what is done...)
Code:
LOGDIR=/logs/out
LOG=`date "+%Y%m%d"`.LOG-FILE.out #the log file 
TEMPDIR=/logs/out/test
DATE=`date +"%d-%m-%Y"`
TIME=`date +"%H:%M:%S"`
CUR_SIZE=`wc -l $LOGDIR/$LOG | awk '{print $1}'`
PREV_SIZE=`cat $TEMPDIR/log.size`
if [ $CUR_SIZE -eq $PREV_SIZE ]
then
   echo " Nothing to do..." > $TEMPDIR/log.diff
else
if [ $CUR_SIZE -gt $PREV_SIZE ]
then
   let STSIZE=$PREV_SIZE+1
   sed -n "$STSIZE,$CUR_SIZE p" $LOGDIR/$LOG > $TEMPDIR/log.diff
   grep 'the message i want to grep from logs' $TEMPDIR/log.diff> $TEMPDIR/log.alarm
   if [ `cat $TEMPDIR/log.alarm |wc -l` -gt 0 ]
   then
      /usr/sbin/sendmail -f ... -t my email address < $TEMPDIR/log.alarm
   fi
fi
echo $CUR_SIZE > $TEMPDIR/log.size

# 3  
Old 10-05-2010
Are you getting any error? or just not receiving mail?
Are you sure the execution is going inside if to call sendmail?
try putting a msg inside if. and echo the count of "$TEMPDIR/log.alarm".

there is no need of cat

use
Code:
wc -l < $TEMPDIR/log.alarm

# 4  
Old 10-05-2010
does the script throw any error msg....?
do $TEMPDIR/log.diff and $TEMPDIR/log.alarm get created...?
# 5  
Old 10-05-2010
Try to run the script in debug mode to see what happens, add the following line:
Code:
set -x

below the shebang #!/bin/ksh
# 6  
Old 10-05-2010
Where does the message :
Quote:
'the message i want to grep from logs'
gets into your log.diff so you can grep it? (I see no where...) and
Code:
echo " Nothing to do..."
> $TEMPDIR/log.diff

At line 11, you just zeroed the log instead of outputing to it (but maybe thats what you want.. but then its difficult to judge on content...
Last edited by vbe; 10-05-2010 at 07:33 AM.. Reason: addendum
# 7  
Old 10-05-2010
the files are being created but they are empty. no data in log.alarm and log.diff.
but in fact there should be data in them
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