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[color]
	ui = true
[core]
	editor = vim
	excludesfile = ~/.gitignore_global
[alias]
	cm = commit -m
	co = checkout
	st = status
	lg = log --color --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit

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Parse json with python

λ curl http://somewhere/data.json | python -m json.tool

Search file by content

Search dir . with conetent partten abc and files with *.php

λ grep --include=\*.php -rnw . -e "abc" 

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After create a account on no-ip.com

Dynamic DNS Update Client (DUC) for Linux

wget http://www.no-ip.com/client/linux/noip-duc-linux.tar.gz
tar vzxf noip-duc-linux.tar.gz
cd noip-2.1.9-1
make
sudo make install

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Computational modle

substition modle

Linear Iteration time = O(n) space = O(1)

Linear Recursion time = O(x) space = O

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ZeroMQ vs Redis

This document is research for the selection of a communication platform for robot-net.

Goal

The purpose of this component is to enable rapid, reliable, and elegant communication between the various nodes of the network, including controllers, sensors, and actuators (robot drivers). It will act as the core of robot-net to create a standardized infrastructure for robot control.

Requirements:

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# Redireact stdout to date-named file
λ echo '123' >> "$(date -d 'yesterday 01:00' '+%Y-%m-%d').log"
λ ls
2018-09-10.log

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Increase volumes in amazon console

EC2 service -> ELASTIC BLOCK STORE -> Chose your volume -> Actions -> Modify Volume

Then wait the process compelete.

Resize file system on instance

ubuntu@ip-172-31-26-7:~$ lsblk
NAME    MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
xvda 202:0 0 20G 0 disk

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// in app root
cd node_modules && ln -nsf ../ @app

// .gitignore
node_modules/*
!node_modules/@app

// *.js
// Before

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tar -vczf targetName.tar --exclude=node_modules --exclude=.git --exclude=./vendor --exclude=./.sass-cache targetName

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/**
 * After aquired a service account's certfication with right permisstion with spreadsheet
 */
import { google } from "googleapis"; // npm i googleapis
const serviceAccount = require('service-account-cert.json')
const auth = new google.auth.JWT(
  serviceAccount.client_email,
  undefined,
  serviceAccount.private_key,
  "https://www.googleapis.com/auth/spreadsheets",