# Note

## Clean VM Size

sudo dd if=/dev/zero of=/free bs=2M; sudo rm -f /free
cd "C:\Program Files\Oracle\VirtualBox" 
VBoxManage.exe modifyhd "D:\18.04\ubuntu.vdi" --compact
VBoxManage.exe modifyhd "D:\Ubuntu\Ubuntu.vdi" --compact

## MD5

certUtil -hashfile C:\TEMP\MyDataFile.img MD5

## NXP LSDK

export CROSS_COMPILE="aarch64-linux-gnu-"; export ARCH="arm64"
git checkout -b linux-4.19 LSDK-19.09-update-311219-V4.19
flex-builder -c linux:linux_4.19:master -a arm64

make -j4 drivers/net/dsa/mv88e6xxx/mv88e6xxx.ko
cp /home/build/linux/linux/arm64/LS/output/master/drivers/net/dsa/mv88e6xxx/mv88e6xxx.ko /lib/modules/4.14.83/kernel/drivers/net/dsa/mv88e6xxx/;sync

ethtool -s lan1 speed 1000 duplex full autoneg off #1000M
mii-tool -A 100baseTx lan1                         #100M
mii-tool -A 10baseT lan1                           #10M

### Python

多個參數:
import os
paramA = "paramA"
paramB = "paramB"
os.system("echo 'python call shell var: %s %s'" % (paramA,paramB))