This script is to filter out the most recurring log messages. I faced an issue where syslog was rapidly increasing (35 GB) in a single day. I have /var/log mounted on root partition and this space usage was causing issue. Courtesy: https://askubuntu.com/a/515152/309358

offending_logs.sh

for log in /var/log/{dmesg,syslog,kern.log}; do 
  echo "${log} :"
  sed -e 's/\[[^]]\+\]//' -e 's/.*[0-9]\{2\}:[0-9]\{2\}:[0-9]\{2\}//' ${log} \
  | sort | uniq -c | sort -hr | head -10
done