Xing Guo higuoxing

set http or socks proxy environment variables

# set http proxy
export http_proxy=http://PROXYHOST:PROXYPORT

# set http proxy with user and password
export http_proxy=http://USERNAME:PASSWORD@PROXYHOST:PROXYPORT

# set http proxy with user and password (with special characters)

Macbook Arch Guide

Installation
General Setup
System Time
Display
Keyboard
Touchpad
Sound
Bluetooth

Configure Git to use a proxy

In Brief

You may need to configure a proxy server if you're having trouble cloning or fetching from a remote repository or getting an error like unable to access '...' Couldn't resolve host '...'.

Consider something like:

	default:
	gcc -O0 -g3 -Wall -Wextra -Wconversion -Wdouble-promotion \
	-Wno-unused-parameter -Wno-unused-function -Wno-sign-conversion \
	main.c

	format:
	clang-format -i main.c

	1) Install cloudflared using homebrew:

	brew install cloudflare/cloudflare/cloudflared

	2) Create /usr/local/etc/cloudflared/config.yaml, with the following content

	proxy-dns: true
	proxy-dns-upstream:
	- https://1.1.1.1/dns-query
	- https://1.0.0.1/dns-query

	1、安装arcanist，clone源代码到安装目录somewhere/，arcanist依赖于libphutil，所以两个都要clone
	somewhere/ git clone git://github.com/facebook/arcanist.git
	somewhere/ git clone git://github.com/facebook/libphutil.git
	2、配置arc，将arc加入到PATH，或在/usr/sbin里面建一个到arc的软链接
	export PATH=$PATH:/somewhere/arcanist/bin/
	或者：cd /usr/sbin; ln -sf /somewhere/arcanist/bin/arc
	* 在系统的~/.bashrc或~/.bash_profile中加上该export语句。
	* 运行命令"arc help"，来检测安装是否成功。
	3、配置arc的编辑器，不然会报错，提示EDITOR环境变量没配置
	arc set-config editor "vim"

	Android Emulator usage: emulator [options] [-qemu args]
	options:
	-sysdir <dir> search for system disk images in <dir>
	-system <file> read initial system image from <file>
	-datadir <dir> write user data into <dir>
	-kernel <file> use specific emulated kernel
	-ramdisk <file> ramdisk image (default <system>/ramdisk.img
	-image <file> obsolete, use -system <file> instead
	-initdata <file> same as '-init-data <file>'
	-data <file> data image (default <datadir>/userdata-qemu.img

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD

	$ brew install libmagic
	$ brew link libmagic (if the link is already created is going to fail, don't worry about that)
	$ env ARCHFLAGS="-arch x86_64" gem install ruby-filemagic -- --with-magic-include=/usr/local/include --with-magic-lib=/usr/local/lib/