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find "first100" filename before 20 days ago in DIR and sort by name, and ls find DIR /. -ctime +20 -type f -iname "first100*" | sort -n | xargs ls -lthr delete them rm -rf `find DIR/. -ctime +20 -type f -iname "first100*" | sort -n`
When I kill all processes of the firefox, ps aux |grep -r firefox | awk '{print $2}' | xargs kill -9