centos-vm-clean

gistfile1.txt

yum clean all

[ -f /root/.bash_history ] && rm -f /root/.bash_history

find /var/log -type f -name "*.log" | while read f; do echo -ne '' > $f; done;

dd if=/dev/zero of=/EMPTY bs=1M
rm -f /EMPTY

count=`df --sync -kP / | tail -n1  | awk -F ' ' '{print $4}'`; 
let count--
dd if=/dev/zero of=/tmp/whitespace bs=1024 count=$count;
rm -f /tmp/whitespace;
 
count=`df --sync -kP /boot | tail -n1 | awk -F ' ' '{print $4}'`;
let count--
dd if=/dev/zero of=/boot/whitespace bs=1024 count=$count;
rm -f /boot/whitespace;
 
swappart=`cat /proc/swaps | tail -n1 | awk -F ' ' '{print $1}'`
swapoff $swappart;
dd if=/dev/zero of=$swappart;
mkswap $swappart;
swapon $swappart;