ulinkwo

public class PipeTest {

    public static void main(String[] args) throws java.io.IOException, java.lang.InterruptedException {
        java.lang.Runtime rt = java.lang.Runtime.getRuntime();
        // Start three processes: ps ax | grep rbe | grep JavaVM
        java.lang.Process p1 = rt.exec("ps ax");
        java.lang.Process p2 = rt.exec("grep rbe");
        java.lang.Process p3 = rt.exec("grep JavaVM");
        // Start piping
        java.io.InputStream in = Piper.pipe(p1, p2, p3);

ulinkwo

			<plugin>
				<groupId>org.codehaus.mojo</groupId>
				<artifactId>buildnumber-maven-plugin</artifactId>
				<version>1.2</version>
				<executions>
					<execution>
						<phase>validate</phase>
						<goals>
							<goal>create</goal>
						</goals>

ulinkwo

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

ulinkwo

class tomcat {
  $tomcat_url = "http://mirrors.axint.net/apache/tomcat/tomcat-7/v7.0.25/bin/apache-tomcat-7.0.25.tar.gz"
  $jdk_url = "http://download.oracle.com/otn-pub/java/jdk/6u25-b06/jdk-6u25-linux-x64.bin"

  Exec {
    path  => "${::path}",
  }
  group { "puppet":
    ensure  => present,
  }

ulinkwo

import java.util.Collection;
import java.util.List;
import java.util.ListIterator;

import org.springframework.data.domain.PageImpl;
import org.springframework.data.domain.Pageable;

/**
 * Extension class between spring data commons and java.util.List that is 
 * required to get MyBatis to use it as a return value.

ulinkwo

#!/usr/bin/env bash
 
# names of latest versions of each package
export NGINX_VERSION=1.11.3
export VERSION_PCRE=pcre-8.38
export VERSION_LIBRESSL=libressl-2.4.2
export VERSION_NGINX=nginx-$NGINX_VERSION
#export NPS_VERSION=1.9.32.10
#export VERSION_PAGESPEED=v${NPS_VERSION}-beta
 

ulinkwo

通过本机的81号端口访问测试服务器89的我的私人apache目录(端口为11063)

使用本地转发，在本机上输入

ssh -L 81:210.32.200.89:11063 suzie@210.32.200.89

这时候打开浏览器,输入地址127.0.0.1:81 我同时也试验了

ssh -L 81:127.0.0.1:11063 suzie@210.32.200.89

ssh -L 81:localhost:11063 suzie@210.32.200.89

ulinkwo

多窗口管理 我们可以使用多窗口，也可以使用多标签来操作。

分割当前的窗口可以使用：

cmd + d 水平分割窗口

cmd + shift + d 垂直分割窗口

cmd + [ 和 cmd + ]在分割窗口之间切换

ulinkwo

Signing is signing data (i.e. gpg --sign the_file)

Certification is signing a key (i.e. gpg --sign-key the_key)

Authentication is signing a challenge (like ssh does). The Authentication stuff can be used to log in to a machine using your GPG key.

The signature math is the same however you do it. The key usage flags are just to classify things.

ulinkwo

GPG and git on macOS

Setup

No need for homebrew or anything like that. Works with https://www.git-tower.com and the command line.

1. Install https://gpgtools.org -- I'd suggest to do a customized install and deselect GPGMail.
2. Create or import a key -- see below for https://keybase.io
3. Run gpg --list-secret-keys and look for sec, use the key ID for the next step
4. Configure git to use GPG -- replace the key with the one from gpg --list-secret-keys