LogReviewScript

#group by causeby by count 
grep -e "\*ERROR\*" -e "Caused by:" $LOGFILE  | sort | uniq -c | sort -nr

#group by Error Type
grep -ioh "TRACE\|INFO\|ERROR\|WARN\|DEBUG" $LOGFILE  | sort | uniq -c | sort -nr

#grep anomalies
grep -i -w 'fatal\|error\|exception\|timeout\|waiting\|fail\|unable\|lock\|block'

#count error span time
grep -i err LOGFILE | awk 'function prt() { if (n) printf "%s\t%s\n",pkey,n } { key=substr($0,0,2); if (key != pkey) { prt(); n=0; pkey=key } n++ } END { prt() }'

#How to grep the Server logs for the last hour (ex. find the ERROR String)
$ grep "^$(date -d '-1 hour' +'%H')" /home/jboss/server.log  | grep 'ERROR'

#How to grep the Server logs for the last minutes (ex. find the ERROR String)
$ sed -n "/^$(date --date='10 minutes ago' '+%H:%M')/,\$p" /home/jboss/log/server.log | grep "ERROR"

#How to find which logs files contain a String in the last n days (ex. 5 days)
$ find . -name "server.log*" -mtime -5 | xargs grep -i "OutOfMemoryError"

#How to count the number of Threads running
$ ps -eLf | grep [PID] | wc -l

#How to monitor a Java Process Heap size
jmap -heap PID

#How to compare two files side by side
sdiff -s standalone1.xml standalone2.xml