Ubuntu dmesg sudo dmesg --clear

sudo cat /var/log/kern.log | grep usb sudo rm -rf /var/log/kern* #old log files sudo zcat /var/log/kern.log.2.gz | grep usb

sudo cat /var/log/syslog | grep usb sudo rm -rf /var/log/syslog*

cat /dev/null > ~/.bash_history && history -c