egrep 'Error|Exception|Debug' logfile.txt
zgrep -i Error *.gz
find /LogFilesfolder/ -iname "SystemOut*" -mtime -7 -exec zgrep "| ERROR |" {} ; >> logReport.txt
find . -type f -size +4096 -atime +30 -exec du -sk '{}' ;
grep -R "<text>"
grep "some Text" File