honwhy

#!/bin/bash

# 在Linux终端使用sed命令，使用正则表达式时+没有被当作元字符
# 1. 使用如下命令
sed -i '/^[0-9]+/d' some.txt
cat some.txt
# 并不能够将数字开头的行删除
# 2. 使用如下命令
sed -i '/^[0-9]\+/d' some.txt

honwhy

在终端输入的命令被记录在history中
只是输入history就可以看到从前的命令
如果要再次执行从前的命令，只要 !1725
!linenumber 即可

honwhy

honwhy@eos:images$ find . -size 0
./18342-106vq6i
./16601-1bgsvrc
./16601-v389qr
./16601-1lsd6ei
./21398-haoave
./18342-zwtoqd
./18342-1404c4x
./20513-1b0wtmo
./18342-14g3r6i

honwhy

sed -i '289,$d' filename

honwhy

var http = require('http');
http.createServer(function(req, res) {
        if(req.url == '/') {
                res.writeHead(200, {'Content-Type': 'text/html'});
                res.end(makeHtml());
        } else if(req.url == '/ajax302'){
                res.writeHead(302, {
                        'Content-Type': 'text/html',
                        //'Location': 'http://localhost:9000/forward' // alert 200
                        'Location': 'https://github.com/join' // alert 0

honwhy

# dump script from http://dubbo.apache.org/zh-cn/docs/dev/principals/dummy.html

JAVA_HOME=/usr/java  
OUTPUT_HOME=~/output  
DEPLOY_HOME=`dirname $0`  
HOST_NAME=`hostname`  
  
DUMP_PIDS=`ps  --no-heading -C java -f --width 1000 | grep "$DEPLOY_HOME" |awk '{print $2}'`  
if [ -z "$DUMP_PIDS" ]; then  
    echo "The server $HOST_NAME is not started!"  

honwhy

public class MultiThreadHashMap {
    private static final Object PRESENT = new Object();
    public static void main(String[] args) throws InterruptedException, BrokenBarrierException {
        final Map<String,Object> map = new HashMap<>(); //let map do resize multiple times
        int N = 1000;
        final CyclicBarrier cyclicBarrier = new CyclicBarrier(N+1);
        for (int i = 0; i < N; i++) {
            new Thread(new Runnable() {
                @Override
                public void run() {

honwhy

package com.honey;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.Random;

public class AesDemo {

honwhy

package com.honey;

import java.util.Arrays;
import java.util.List;
import java.util.concurrent.*;

public class ConsumerQueueDemo {

    public static void main(String[] args) {
        //making hot spot code

honwhy

package com.honey;

import java.io.File;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.ArrayList;