iotts@jacklu:~$ cd /home/iotts/
iotts@jacklu:~$ mkdir apache-apollo
wget http://mirror.bit.edu.cn/apache/activemq/activemq-apollo/1.7.1/apache-apollo-1.7.1-unix-distro.tar.gz

tar -zxvf apache-apollo-1.7.1-unix-distro.tar.gz

cd apache-apollo-1.7.1/bin/

iotts@jacklu:~/apache-apollo/apache-apollo-1.7.1/bin$ ./apollo
usage: apollo [--log <log_level>] <command> [<args>]

The most commonly used apollo commands are:
    create           creates a new broker instance
    disk-benchmark   Benchmarks your disk's speed
    help             Display help information
    version          Displays the broker version

See 'apollo help <command>' for more information on a specific command.

iotts@jacklu:~/apache-apollo/apache-apollo-1.7.1/bin$ ./apollo create iotts_broker
Creating apollo instance at: iotts_broker
Generating ssl keystore...

You can now start the broker by executing:  

   "/home/iotts/apache-apollo/apache-apollo-1.7.1/bin/iotts_broker/bin/apollo-broker" run

Or you can setup the broker as system service and run it in the background:

   sudo ln -s "/home/iotts/apache-apollo/apache-apollo-1.7.1/bin/iotts_broker/bin/apollo-broker-service" /etc/init.d/
   /etc/init.d/apollo-broker-service start

iotts@jacklu:~/apache-apollo/apache-apollo-1.7.1/bin$ iotts_broker/bin/apollo-broker run

    _____                .__  .__
   /  _  \ ______   ____ |  | |  |   ____
  /  /_\  \\____ \ /  _ \|  | |  |  /  _ \
 /    |    \  |_> >  <_> )  |_|  |_(  <_> )
 \____|__  /   __/ \____/|____/____/\____/
         \/|__|  Apache Apollo (1.7.1)


Loading configuration file '/home/iotts/apache-apollo/apache-apollo-1.7.1/bin/iotts_broker/etc/apollo.xml'.
INFO  | OS     : Linux 4.10.0-42-generic (Ubuntu 16.04.3 LTS)
INFO  | JVM    : Java HotSpot(TM) Server VM 1.8.0_151 (Oracle Corporation)
INFO  | Apollo : 1.7.1 (at: /home/iotts/apache-apollo/apache-apollo-1.7.1)
INFO  | OS is restricting the open file limit to: 100000
INFO  | Accepting connections at: tcp://0.0.0.0:61613
INFO  | Accepting connections at: tls://0.0.0.0:61614
INFO  | Starting store: leveldb store at /home/iotts/apache-apollo/apache-apollo-1.7.1/bin/iotts_broker/data
INFO  | Accepting connections at: ws://0.0.0.0:61623/
INFO  | Accepting connections at: wss://0.0.0.0:61624/
INFO  | virtual host startup is waiting on store startup
INFO  | virtual host startup is no longer waiting.  It waited a total of 1 seconds.
INFO  | broker startup is waiting on start jetty webserver
INFO  | Administration interface available at: https://127.0.0.1:61681/
INFO  | Administration interface available at: http://127.0.0.1:61680/
INFO  | broker startup is no longer waiting.  It waited a total of 7 seconds.

sudo mkdir /usr/local/java

cd /usr/local/java

sudo tar xvf jdk-8u151-linux-i586.tar.gz

sudo rm jdk-8u151-linux-i586.tar.gz

$sudo gedit ~/.bashrc

vi ~/.bashrc

export JAVA_HOME=/usr/local/java/jdk1.8.0_151  
export JRE_HOME=${JAVA_HOME}/jre  
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib  
export PATH=${JAVA_HOME}/bin:$PATH

source ~/.bashrc

java -version

iotts@jacklu:~$ java -version
java version "1.8.0_151"
Java(TM) SE Runtime Environment (build 1.8.0_151-b12)
Java HotSpot(TM) Client VM (build 25.151-b12, mixed mode)
iotts@jacklu:~$ 

#define MON  1
#define TUE   2
#define WED  3
#define THU   4
#define FRI    5
#define SAT   6
#define SUN   7

enum DAY
{
      MON=1, TUE, WED, THU, FRI, SAT, SUN
};

char     a; //变量a的类型均为字符型char
char     letter;
int        x,
           y,
           z; //变量x,y和z的类型均为整型int
int       number;
double  m, n;
double  result; //变量result的类型为双精度浮点型double

enum DAY
{
      MON=1, TUE, WED, THU, FRI, SAT, SUN
};

enum DAY yesterday;
enum DAY today;
enum DAY tomorrow; //变量tomorrow的类型为枚举型enum DAY
enum DAY good_day, bad_day; //变量good_day和bad_day的类型均为枚举型enum DAY

enum //跟第一个定义不同的是，此处的标号DAY省略，这是允许的。
{
    saturday,
    sunday = 0,
    monday,
    tuesday,
    wednesday,
    thursday,
    friday
} workday; //变量workday的类型为枚举型enum DAY

enum week { Mon=1, Tue, Wed, Thu, Fri Sat, Sun} days; //变量days的类型为枚举型enum week

enum BOOLEAN { false, true } end_flag, match_flag; //定义枚举类型并声明了两个枚举型变量

typedef enum workday
{
    saturday,
    sunday = 0,
    monday,
    tuesday,
    wednesday,
    thursday,
    friday
} workday; //此处的workday为枚举型enum workday的别名

workday today, tomorrow; //变量today和tomorrow的类型为枚举型workday，也即enum workday

typedef enum
{
    saturday,
    sunday = 0,
    monday,
    tuesday,
    wednesday,
    thursday,
    friday
} workday; //此处的workday为枚举型enum workday的别名

workday today, tomorrow; //变量today和tomorrow的类型为枚举型workday，也即enum workday

typedef enum workday
{
    saturday,
    sunday = 0,
    monday,
    tuesday,
    wednesday,
    thursday,
    friday
};

workday today, tomorrow; //变量today和tomorrow的类型为枚举型workday，也即enum workday

typedef enum
{
    wednesday,
    thursday,
    friday
} workday;

typedef enum WEEK
{
    saturday,
    sunday = 0,
    monday,
} workday;

typedef enum
{
    wednesday,
    thursday,
    friday
} workday_1;

typedef enum WEEK
{
    wednesday,
    sunday = 0,
    monday,
} workday_2;

#include<stdio.h>

/* 定义枚举类型 */
enum DAY { MON=1, TUE, WED, THU, FRI, SAT, SUN };

void main()
{
    /* 使用基本数据类型声明变量，然后对变量赋值 */
    int x, y, z;
    
    x = 10;
    y = 20;
    z = 30;
    
    /* 使用枚举类型声明变量，再对枚举型变量赋值 */
    enum DAY yesterday, today, tomorrow;
    
    yesterday = MON;
    today     = TUE;
    tomorrow  = WED;
    
    printf("%d %d %d \n", yesterday, today, tomorrow);
}

#include <stdio.h>

/* 定义枚举类型 */
enum DAY { MON=1, TUE, WED, THU, FRI, SAT, SUN };

void main()
{
    /* 使用基本数据类型声明变量同时对变量赋初值 */
    int x=10, y=20, z=30;
    
    /* 使用枚举类型声明变量同时对枚举型变量赋初值 */
    enum DAY yesterday = MON, 
                        today = TUE,
                   tomorrow = WED;
    
    printf("%d %d %d \n", yesterday, today, tomorrow);
}

#include <stdio.h>

/* 定义枚举类型，同时声明该类型的三个变量，它们都为全局变量 */
enum DAY { MON=1, TUE, WED, THU, FRI, SAT, SUN } yesterday, today, tomorrow;

/* 定义三个具有基本数据类型的变量，它们都为全局变量 */
int x, y, z;

void main()
{
    /* 对基本数据类型的变量赋值 */
    x = 10;  y = 20;  z = 30;
    
    /* 对枚举型的变量赋值 */
    yesterday = MON;
    today     = TUE;
    tomorrow  = WED;
    
    printf("%d %d %d \n", x, y, z); //输出：10 20 30
    printf("%d %d %d \n", yesterday, today, tomorrow); //输出：1 2 3
}

#include <stdio.h>

/* 定义枚举类型，同时声明该类型的三个变量，并赋初值。它们都为全局变量 */
enum DAY
{
    MON=1, 
    TUE,
    WED,
    THU,
    FRI,
    SAT,
    SUN 
}
yesterday = MON, today = TUE, tomorrow = WED;

/* 定义三个具有基本数据类型的变量，并赋初值。它们都为全局变量 */
int x = 10, y = 20, z = 30;

void main()
{
    printf("%d %d %d \n", x, y, z); //输出：10 20 30
    printf("%d %d %d \n", yesterday, today, tomorrow); //输出：1 2 3
}

#include <stdio.h>

enum DAY { MON=1, TUE, WED, THU, FRI, SAT, SUN };

void main()
{
    enum DAY yesterday, today, tomorrow;

    yesterday = TUE;
    today = (enum DAY) (yesterday + 1); //类型转换
    tomorrow = (enum DAY) 30; //类型转换
    //tomorrow = 3; //错误
    
    printf("%d %d %d \n", yesterday, today, tomorrow); //输出：2 3 30
}

#include<stdio.h>

enum
{ 
    BELL          = '\a',
    BACKSPACE = '\b',
    HTAB         = '\t',
    RETURN      = '\r',
    NEWLINE    = '\n', 
    VTAB         = '\v',
    SPACE       = ' '
};

enum BOOLEAN { FALSE = 0, TRUE } match_flag;

void main()
{
    int index = 0;
    int count_of_letter = 0;
    int count_of_space = 0;
    
    char str[] = "I'm Ely efod";
    
    match_flag = FALSE;
    
    for(; str[index] != '\0'; index++)
        if( SPACE != str[index] )
            count_of_letter++;
        else
        {
            match_flag = (enum BOOLEAN) 1;
            count_of_space++;
        }
    
    printf("%s %d times %c", match_flag ? "match" : "not match", count_of_space, NEWLINE);
    printf("count of letters: %d %c%c", count_of_letter, NEWLINE, RETURN);
}

match 2 times
count of letters: 10
Press any key to continue

#include <stdio.h>

enum escapes
{ 
    BELL      = '\a',
    BACKSPACE = '\b',
    HTAB      = '\t',
    RETURN    = '\r',
    NEWLINE   = '\n', 
    VTAB      = '\v',
    SPACE     = ' '
};

enum BOOLEAN { FALSE = 0, TRUE } match_flag;

void main()
{
    printf("%d bytes \n", sizeof(enum escapes)); //4 bytes
    printf("%d bytes \n", sizeof(escapes)); //4 bytes
    
    printf("%d bytes \n", sizeof(enum BOOLEAN)); //4 bytes
    printf("%d bytes \n", sizeof(BOOLEAN)); //4 bytes
    printf("%d bytes \n", sizeof(match_flag)); //4 bytes
    
    printf("%d bytes \n", sizeof(SPACE)); //4 bytes
    printf("%d bytes \n", sizeof(NEWLINE)); //4 bytes
    printf("%d bytes \n", sizeof(FALSE)); //4 bytes
    printf("%d bytes \n", sizeof(0)); //4 bytes
}

#include<stdio.h>

enum Season
{
    spring, summer=100, fall=96, winter
};

typedef enum
{
    Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday
}
Weekday;

void main()
{
    /* Season */
    printf("%d \n", spring); // 0
    printf("%d, %c \n", summer, summer); // 100, d
    printf("%d \n", fall+winter); // 193
    
    Season mySeason=winter;
    if(winter==mySeason)
        printf("mySeason is winter \n"); // mySeason is winter
    
    int x=100;
    if(x==summer)
        printf("x is equal to summer\n"); // x is equal to summer
    
    printf("%d bytes\n", sizeof(spring)); // 4 bytes
    
    /* Weekday */
    printf("sizeof Weekday is: %d \n", sizeof(Weekday)); //sizeof Weekday is: 4
    
    Weekday today = Saturday;
    Weekday tomorrow;
    if(today == Monday)
        tomorrow = Tuesday;
    else
        tomorrow = (Weekday) (today + 1); //remember to convert from int to Weekday
}

zip -r xxx.zip ./*

unzip filename.zip

tar -zcvf /home/zdzlibs.tar.gz /home/zdz/java/zdzlibs/

getconf LONG_BIT

32

uname -a

Linux jacklu 4.13.0-26-generic #29~16.04.2-Ubuntu SMP Tue Jan 9 21:38:24 UTC 2018 i686 i686 i686 GNU/Linux

cat /etc/issue

Ubuntu 16.04.3 LTS \n \l

sudo lsb_release -a

No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 16.04.3 LTS
Release:	16.04
Codename:	xenial

# vim /etc/my.cnf 

skip-grant-tables 

[mysqld] 
datadir=/var/lib/mysql 
socket=/var/lib/mysql/mysql.sock 
skip-grant-tables 

# service mysqld restart 
Stopping MySQL: [ OK ] 
Starting MySQL: [ OK ]

# mysql 
Welcome to the MySQL monitor. Commands end with ; or \g. 
Your MySQL connection id is 3 to server version: 3.23.56 
Type 'help;' or '\h' for help. Type '\c' to clear the buffer. 
mysql> USE mysql ; 
Database changed 
mysql> UPDATE user SET Password = password ( 'new-password' ) WHERE User = 'root' ; 
Query OK, 0 rows affected (0.00 sec) 
Rows matched: 2 Changed: 0 Warnings: 0 
mysql> flush privileges ; 
Query OK, 0 rows affected (0.01 sec) 
mysql> quit

# vim /etc/my.cnf 

# service mysqld restart 
Stopping MySQL: [ OK ] 
Starting MySQL: [ OK ]

npm uninstall hexo-renderer-marked --save
npm install hexo-renderer-kramed --save

//escape: /^\\([\\`*{}\[\]()#$+\-.!_>])/,      第11行，将其修改为
escape: /^\\([`*\[\]()#$+\-.!_>])/,
//em: /^\b_((?:__|[\s\S])+?)_\b|^\*((?:\*\*|[\s\S])+?)\*(?!\*)/,    第20行，将其修改为
em: /^\*((?:\*\*|[\s\S])+?)\*(?!\*)/,

hexo clean
hexo g

---
date: 2017/8/3 18:20:00
tags: hexo
mathjax: true
title: hexo博客MathJax公式渲染
---

f(x)=\begin{cases}语句1\\语句2\\...\end{cases}

 $$ 
f(n)=\begin{cases}
n/2, & \text{如果$ x<=2 $}\\
3n+1, & \text{如果$ x>2 $}
\end{cases}
$$

 $$
f([\frac{1+\{x,y\}}{(\frac{x}{y}+\frac{y}{x})(u+1)}+a]^{3\2})
$$

    $$
f\left(
    \left[
        \frac{
            1+\left\{x,y\right\}
        }{
        \left(
            \frac{x}{y}+\frac{y}{x}
        \right)
        \left(u+1\right)
        }+a
    \right]^{3\2}
\right)
$$

$$
\require{enclose}\begin{array}{}
\enclose{horizontalstrike}{x+y}\\
\enclose{horizontalstrike}{x*y}\\
\end{array}
$$

$$
\begin{align}
f(x) &=a+b+a\\
& = 2a+b
\end{align}
$$