script to grep only the lasts errors

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# 1  
Old 06-07-2011
script to grep only the lasts errors


sorry if there already a thread about this, I did a little bit of digging but haven't found exactly what I want.
I have a java application on a glassfish server who crash from time to time Smilie

I need a script to allert me if there's a error like "java heappspace" or "out of memory" in the server.log

for now I've done that :
SUBJ_MAIL="alert java  heapspace blablabla"
/usr/xpg4/bin/grep -q 'Java heap space'  $DIR/server.log
if [ $? -eq 0 ]
    then echo "alerte java heapspace was found" | $MAIL -s "$SUBJ_MAIL" $DEST_MAIL

it works fine but the thing is, the log roll is every 10Mo and I don't want to change that, and the script will continue to allerte me even if the error was taking care of (until the server.log is archive and a new one is created)

So I need to find a way to grep this type of error, but to detect if this error has already bin found
I really don't know how to start....if there's any idea?

I'm on a Soalris 10


Last edited by Franklin52; 06-07-2011 at 06:35 AM.. Reason: Please use code tags
# 2  
Old 06-07-2011
create a file called /tmp/count and enter 0

SUBJ_MAIL="alert java heapspace blablabla"
################added newly##############
error_count=`cat $err_count_file`
count=`/usr/xpg4/bin/grep -c 'Java heap space' $DIR/server.log`
if [ "$count" -gt "$error_count" ]
  echo "alerte java heapspace was found" | $MAIL -s "$SUBJ_MAIL" $DEST_MAIL
  echo $count > $err_count_file
 exit 0

# 3  
Old 06-07-2011
well thanks, but doesn't work :-/ .... no email is sent....

but anyway, the condition is not satisfying ..... let's admit that I have an old java heap space in my server.log (who has already been treated), the grep will continue to count it, and the variable $count will still be greater than $error_count

maybe by just checking the log from the last XX minutes..... or something like that
# 4  
Old 06-07-2011
check the "mail" if any errors in sending the mail.

Add one more echo line inside "if" and direct the output to a log file to debug further.

check /tmp/count file as well ( whether does it have a new value )
# 5  
Old 06-07-2011
ok my bad, there was a quote missing ^^

so the script is working fine, but only until the log is archive and a new one is created
if a new log file is created, the old count stays in the "count" file .....and the script doesn't put 0 when it doesn't find anymore error ....
# 6  
Old 06-09-2011
ok, I finally did what I want

I made some adjustments to the previous script so if there's a lot of java heap space I don't receive a lot of mail^^

for info, here it is :

SUBJ_MAIL="[ALERTE]Java  heapspace was found"
error_count=`cat $DIR_COUNT/count`
/usr/xpg4/bin/grep -q 'Java heap space'  $DIR/server.log
if [ $? -ne 0 ]
    then echo $START > $DIR/count
count=`grep -c 'Java heap space' $DIR/server.log`
if [ "$count" -gt "$error_count" ]
        echo "Java heap space found " | $MAIL -s "$SUBJ_MAIL" $DEST_MAIL &&  echo $count > $err_count_file

	echo $count > $err_count_file && exit 0

Last edited by pludi; 06-09-2011 at 07:27 AM..
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