zhaohangbo’s gists

zhaohangbo / Phabricator命令行工具Arcanist的基本用法

Last active July 28, 2020 03:25

	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"

zhaohangbo / sql-migrate

Created September 1, 2016 04:41

	sql-migrate工具

	工具:sql-migrate
	https://github.com/rubenv/sql-migrate
	模板:mysql代码库from公司
	http://git.yottabyte.cn/summary/mysql.git
	Available commands are:
	down Undo a database migration（只恢复一个）
	redo Reapply the last migration
	status Show migration status

zhaohangbo / Linux Command

Last active September 1, 2016 05:28

	xargs

	问题：在管道命令 \| 后面加不加xargs有什么区别？
	区别：
	管道是实现“将前面的标准输出作为后面的标准输入”
	xargs是实现“将标准输入作为命令的参数”

	例如，
	echo "--help"\|cat，相当于 cat "--help", --help作为cat的标准输入流(STDIN)
	echo "--help"\|xargs cat 相当于 cat --help , --help作为cat的参数

zhaohangbo / Java Serializable Object to Byte Array

Created September 23, 2016 13:12

Java Serializable Object to Byte Array

	http://stackoverflow.com/questions/2836646/java-serializable-object-to-byte-array

	ByteArrayOutputStream bos = new ByteArrayOutputStream();
	ObjectOutputStream out = null;
	try {
	out = new ObjectOutputStream(bos);
	out.writeObject(yourObject);
	out.flush();
	byte[] yourBytes = bos.toByteArray();
	...

zhaohangbo / 换行符 \r, \n, \r\n

Created September 24, 2016 05:37

换行符 \r, \n, \r\n

	\r = CR (Carriage Return) // Used as a new line character in Mac OS before X

	\n = LF (Line Feed) // Used as a new line character in Unix/Mac OS X

	\r\n = CR + LF // Used as a new line character in Windows

	So,

	String lines[] = String.split("\\r?\\n");

zhaohangbo / NullNotNone.scala

Created November 21, 2016 04:31

Use Option(x) instead of Some(x) to avoid Some(null)

	object NullNotNone {
	def main(args: Array[String]) {
	test_func match {
	case None => println("null is not none")
	case Some(x) => println("so easy to be wrong")
	}
	}

	def test_func: Option[java.lang.Double] = Some(null)
	}

zhaohangbo / Google Tips

Created November 21, 2016 06:30

Google搜索技巧

	1、双引号 “”

	完全匹配搜索，返回的结果包含双引号中出现的所有的词，连顺序也必须完全匹配。
	例如搜索： “seo方法图片”

	2、减号 -

	减号代表搜索不包含减号后面的词的页面。使用这个指令时减号前面必须是空格，减号后面没有空格，紧跟着需要排除的词。Google 和bd都支持这个指令。
	例如：搜索 -引擎
	返回的则是包含“搜索”这个词，却不包含“引擎”这个词的结果

zhaohangbo / Java转成Scala

Last active November 30, 2016 09:46

Java转成Scala

	Java代码转换成Scala，常见的一些转换


	转换：
	SomeType.class ==> classOf[SomeType]
	Class<?> ==> def read[UnknowType](classes: Set[Class[UnknowType]])
	https://stackoverflow.com/questions/1135248/scala-equivalent-of-java-java-lang-classt-object

	Java代码：
	public Swagger read(Set<Class<?>> classes) {

zhaohangbo / SSH的public_key和private_key

Created December 2, 2016 06:53

SSH的public_key和private_key

	SSH的public_key和private_key

	1、private_key [on your own PC]
	Stored on the computer you log in from

	2、public_key [on other PCs]
	Stored on the .ssh/authorized_keys file on all the computers you want to log in to.

	How it works ?
	When you log in to a computer,

zhaohangbo / Mac使用机械键盘和改键工具

Created December 27, 2016 03:17

Mac使用机械键盘和改键工具