find . -name "*.log" -m time +30 -type f -size +100M | xargs rm -rf {};
find . -name "*.log" -mtime +30 -type f -size +100M | xargs rm -rf {};
find . -name "*.log" -mtime +30 -type -size 100M | xargs rm -rf {};
find . -name "*.log" -mtime +30 -type f -size 100M | xargs rm -rf {};