taoza itbj

What the hell are environment variables?

They're just variables you set on your system that various programs/processes can read. A fairly standard example in javascript circles would be setting your NODE_ENV variable to "production" or "development", altering how node code is executed on your system (for example showing more debug messaging when in development).

With most shells there's a way to set them for the current session, and a way to set them for all sessions. The following is meant to be a guide on how to set env vars in the various shells.

Bash (The default shell on OSX)

Setting for the session:

Python Socket 编程详细介绍

Python 提供了两个基本的 socket 模块：

Socket 它提供了标准的BSD Socket API。
SocketServer 它提供了服务器重心，可以简化网络服务器的开发。

下面讲解下 Socket模块功能。

Socket 类型

ArchLinux Cheat Sheet

Network configuration

List network devices
```
  # ip link
```
Enabling and disabling network interfaces
```
  # ip link set <network interface> up
```

ip link set down

Setup Ubuntu 16.04 to be used with Vagrant and Virtualbox

Prepare Vagrant box with Ubuntu 16.04

We will use official box "ubuntu/xenial64" and modify it to work with Vagrant.

Vagrantfile

install zbar on windows with include and library files
make sure mingw installed and bin directory added to the path
in PYTHONPATH\Lib\distutils, create a file distutils.cfg and add two lines:

[build]

compiler=mingw32
get dll lib and include file from ftp://sourceware.org/pub/pthreads-win32/dll-latest copy files to PATH_MINGW32/[lib,bin,include] separately, just need file name like pthreadGC2 and remember to chang the name to libpthread
change or add lines in setup.py:

	# -- coding: utf-8 --

	import wifi


	def Search():
	wifilist = []

	cells = wifi.Cell.all('wlan0')


	archive
	log config
	logging enable
	notify syslog contenttype plaintext
	hidekeys

	event manager applet Config_Change authorization bypass
	event config
	action 1.1 cli command "enable"

	---
	- hosts: all
	connection: paramiko
	vars:
	ansible_ssh_private_key_file: /path/to/private_key
	ansible_ssh_pass: passphrase_for_private_key
	tasks:
	- debug:
	msg: hello

	---
	- hosts: ios
	connection: local

	vars:
	backup_root: /tmp/backups

	cli:
	host: "{{ inventory_hostname }}"
	username: cisco

	# I tried to use the pip install wifi but it really didn't work.
	# So created this
	import subprocess

	process = subprocess.Popen(['/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport','-I'], stdout=subprocess.PIPE)
	out, err = process.communicate()
	process.wait()
	print(out)

	'''