How to generate Anki Decks

1.use iphone to take a picture

• you can choice use iphone to take OCR or directly take picture and covert it by yourself (From .HEIC format to png format)

如何判斷server 是否有使用load blance

如何判斷server 是否有使用load blance

使用hping2. 來看packets loss 或者 是否有使用load blance ,可以看到要是回應的id 有兩組號碼區間在回覆，吉表示有兩組server 在後段服務

`sudo hping2 -c 10 -i 1 -p 443 -S google.com

HPING google.com (en0 142.251.43.14): S set, 40 headers + 0 data bytes
len=52 ip=142.251.43.14 ttl=55 id=15396 sport=443 flags=SA seq=0 win=65535 rtt=9.1 ms
len=52 ip=142.251.43.14 ttl=119 id=39684 sport=443 flags=SA seq=1 win=65535 rtt=7.5 ms
len=52 ip=142.251.43.14 ttl=119 id=47763 sport=443 flags=SA seq=2 win=65535 rtt=9.8 ms
len=52 ip=142.251.43.14 ttl=55 id=3033 sport=443 flags=SA seq=3 win=65535 rtt=9.5 ms
len=52 ip=142.251.43.14 ttl=118 id=61592 sport=443 flags=SA seq=4 win=65535 rtt=7.5 ms
len=52 ip=142.251.43.14 ttl=119 id=62460 sport=443 flags=SA seq=5 win=65535 rtt=10.2 ms
len=52 ip=142.251.43.14 ttl=119 id=4097 sport=443 flags=SA seq=6 win=65535 rtt=7.5 ms
len=52 ip=142.251.43.14 ttl=119 id=15781 sport=443 flags=SA seq=7 win=65535 rtt=10.6 ms
len=52 ip=142.251.43.14 ttl=119 id=4205 sport=443 flags=SA seq=8 win=65535 rtt=7.5 ms
len=52 ip=142.251.43.14 ttl=55 id=65346 sport=443 flags=SA seq=9 win=65535 rtt=8.4 ms`

ＭＴＵ大小問題

一班正常MTU 用1500 但vpn 可能可以設定1444
原則就是盡量不要讓封包被拆成兩個
可以指定封包大小來測試MTU設定是否適當
`

ping -c 1 -D -s 1500 8.8.8.8

`

程式：命名規則

• 駝峰式：Camel Case：單字的首字母大寫
  • Upper camel case(PascalCase): 所有單字的首字母大寫,例如FirstName
  • lower camel case：第一個單字的字母小寫，其餘的字母大寫，例如firstName
• Snake Case:單字與單字間使用下劃線分隔(像蛇）
  • 例如：first_name
• kebab Case (spinal-case, Train-Case, Lisp-case), 單字與單字間使用連接符號(烤肉串）
  • 例如： first-name

Web Browsing through terminal

• Install xterm on remote linux server

  sudo apt-get install w3m w3m-img
  sudo apt-get install xterm
  

• on local target machine

  ssh -X  user@[ip]  -> linux
  ssh -U  user@[ip]. --> mac
  

How to find my ip

有時候，你需要知道自己的ip 位址，這時候可以簡單用個curl

curl ifconfig.me

HuskyLens upgrade

1.clone repo from github

git clone  https://github.com/HuskyLens/HUSKYLENSUploader.git

Install pip3 on MAC

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
brew install python3

install pip3 on Linux

sudo apt install python3-pip

• Run the following code to install pyserial:

sudo pip3 install pyserial

• Go to the HUSKYLENSUploader folder

cd HUSKYLENSUploader

• Run the following code to update the firmware:

sudo python3 kflash.py -b 2000000 HUSKYLENSWithModelV0.4.7Stable.kfpkg

Raspberry pi

sudo killall wpa_supplicant
sudo wpa_supplicant -c/etc/wpa_supplicant/wpa_supplicant.conf -iwlan0