# /etc/init.d/apache2 start

# ls -l /etc/rc?.d/*apache2
lrwxrwxrwx 1 root root 17 Feb  5 21:47 /etc/rc0.d/K09apache2 -> ../init.d/apache2
lrwxrwxrwx 1 root root 17 Feb  5 21:47 /etc/rc1.d/K09apache2 -> ../init.d/apache2
lrwxrwxrwx 1 root root 17 Feb  5 21:47 /etc/rc2.d/K09apache2 -> ../init.d/apache2
lrwxrwxrwx 1 root root 17 Feb  5 21:47 /etc/rc3.d/K09apache2 -> ../init.d/apache2
lrwxrwxrwx 1 root root 17 Feb  5 21:47 /etc/rc4.d/K09apache2 -> ../init.d/apache2
lrwxrwxrwx 1 root root 17 Feb  5 21:47 /etc/rc5.d/K09apache2 -> ../init.d/apache2
lrwxrwxrwx 1 root root 17 Feb  5 21:47 /etc/rc6.d/S09apache2 -> ../init.d/apache2

# 0 - 停机
# 1 - 单用户模式
# 2 - 多用户，没有 NFS
# 3 - 完全多用户模式(标准的运行级)
# 4 – 系统保留的
# 5 - X11 （x window)
# 6 - 重新启动

sudo apt-get install rcconf
sudo rcconf

# update-rc.d -f apache2 remove

# update-rc.d apache2 defaults
Adding system startup for /etc/init.d/apache2 ...
/etc/rc0.d/K20apache2 -> ../init.d/apache2
/etc/rc1.d/K20apache2 -> ../init.d/apache2
/etc/rc6.d/K20apache2 -> ../init.d/apache2
/etc/rc2.d/S20apache2 -> ../init.d/apache2
/etc/rc3.d/S20apache2 -> ../init.d/apache2
/etc/rc4.d/S20apache2 -> ../init.d/apache2
/etc/rc5.d/S20apache2 -> ../init.d/apache2

# update-rc.d apache2 defaults 91
Adding system startup for /etc/init.d/apache2 ...
/etc/rc0.d/K91apache2 -> ../init.d/apache2
/etc/rc1.d/K91apache2 -> ../init.d/apache2
/etc/rc6.d/K91apache2 -> ../init.d/apache2
/etc/rc2.d/S91apache2 -> ../init.d/apache2
/etc/rc3.d/S91apache2 -> ../init.d/apache2
/etc/rc4.d/S91apache2 -> ../init.d/apache2
/etc/rc5.d/S91apache2 -> ../init.d/apache2

# update-rc.d apache2 defaults 20 80
Adding system startup for /etc/init.d/apache2 ...
/etc/rc0.d/K80apache2 -> ../init.d/apache2
/etc/rc1.d/K80apache2 -> ../init.d/apache2
/etc/rc6.d/K80apache2 -> ../init.d/apache2
/etc/rc2.d/S20apache2 -> ../init.d/apache2
/etc/rc3.d/S20apache2 -> ../init.d/apache2
/etc/rc4.d/S20apache2 -> ../init.d/apache2
/etc/rc5.d/S20apache2 -> ../init.d/apache2

# update-rc.d apache2 start 20 2 3 4 5 . stop 80 0 1 6 .
Adding system startup for /etc/init.d/apache2 ...
/etc/rc0.d/K80apache2 -> ../init.d/apache2
/etc/rc1.d/K80apache2 -> ../init.d/apache2
/etc/rc6.d/K80apache2 -> ../init.d/apache2
/etc/rc2.d/S20apache2 -> ../init.d/apache2
/etc/rc3.d/S20apache2 -> ../init.d/apache2
/etc/rc4.d/S20apache2 -> ../init.d/apache2
/etc/rc5.d/S20apache2 -> ../init.d/apache2

# update-rc.d apache2 start 20 2 3 4 . start 30 5 . stop 80 0 1 6 .
Adding system startup for /etc/init.d/apache2 ...
/etc/rc0.d/K80apache2 -> ../init.d/apache2
/etc/rc1.d/K80apache2 -> ../init.d/apache2
/etc/rc6.d/K80apache2 -> ../init.d/apache2
/etc/rc2.d/S20apache2 -> ../init.d/apache2
/etc/rc3.d/S20apache2 -> ../init.d/apache2
/etc/rc4.d/S20apache2 -> ../init.d/apache2
/etc/rc5.d/S30apache2 -> ../init.d/apache2

sudo chkconfig --add apache2

sudo chkconfig -- level 35 apache2 on

# cd ~/Downloads/
# Move the downloaded file to ~/Android/ directory #
mv genymotion-2.6.0_x64.bin ~/Android/

# Set executable permission
chmod +x genymotion-2.6.0_x64.bin

# Install genymotion by running the file
./genymotion-2.6.0_x64.bin

# Navigate into genymotion directory
cd genymotion

# launch the genymotion #
./genymotion

$ PATH=$PATH:/home/einverne/Android/genymotion/

$ pip install virtualenv
$ cd my_project_folder
$ virtualenv .			# create virtual env in current folder
$ source bin/activate

$ pip install django  	# install latest version
# pip install django==1.9 或者指定某一版本
# pip install django --upgrade
$ django-admin startproject projectname

$ python manage.py help
$ python manage.py runserver [port]
$ python manage.py makemigrations # 每一次修改 model 之后需要运行，之后需要运行 migrate
$ python manage.py migrate   # 已经代替了 python manage.py syncdb 数据库相关，创建表
$ python manage.py createsuperuser
$ python manage.py startapp appname

less [options] 文件

-b  缓冲区大小 设置缓冲区的大小
-e  当文件显示结束后，自动离开
-f  强迫打开特殊文件，例如外围设备代号、目录和二进制文件
-g  只标志最后搜索的关键词
-i  忽略搜索时的大小写
-m  显示类似 more 命令的百分比
-N  显示每行的行号
-o  文件名 将 less 输出的内容在指定文件中保存起来
-Q  不使用警告音
-s  显示连续空行为一行
-S  行过长时间将超出部分舍弃
-x  数字  将“tab”键显示为规定的数字空格

jk      下 / 上 一行
G       移动到最后一行
g       移动到第一行
q / ZZ  退出 less 命令
/       字符串：向下搜索“字符串”的功能
?       字符串：向上搜索“字符串”的功能
n       重复前一个搜索（与 / 或 ? 有关）
N       反向重复前一个搜索（与 / 或 ? 有关）
h       显示帮助界面
y       向前滚动一行
空格键 滚动一页
回车键 滚动一行
[pagedown] 向下翻动一页
[pageup]   向上翻动一页

f 向下移动一屏
b 向上移动一屏
d 向下移动半屏
u 向上移动半屏

F   like tail -f
v   使用配置的编辑器编辑当前文件
h   显示 less 的帮助文档
&pattern   仅显示匹配模式的行，而不是整个文件

ma   使用 a 标记文本的当前位置
'a   导航到标记 a 处

less /var/log/syslog

ps -ef |less

apt search nemo | less

history | less

less /var/log/syslog /var/log/mysql/error.log

ffplay [options] input_file

ffplay -autoexit demo.mp4

ffplay -x 640 -y 480 demo.mp4

ffplay -ss 10 demo.mp4

ffplay -t 10 demo.mp4

ffplay -an demo.mp4

ffplay -vn demo.mp4

ffplay -window_title myplayer -loop 2 demo.mp4

ffplay -showmode rdft demo.mp4

ffplay udp://127.0.0.1:8080

ffmpeg -r 25 -i demo.mp4 -f mpegts udp://127.0.0.1:8080

q, ESC            退出
f                 全屏
p, SPC            暂停
w                 切换显示模式(视频/音频波形/音频频带)
s                 步进到下一帧
left/right        快退/快进 10 秒
down/up           快退/快进 1 分钟
page down/page up 跳转到前一章/下一章(如果没有章节，快退/快进 10 分钟)
mouse click       跳转到鼠标点击的位置(根据鼠标在显示窗口点击的位置计算百分比)

#include <iostream>
#include <string>
#include <boost/assign.hpp>
#include <boost/typeof/typeof.hpp>
#include <boost/assign.hpp>
#include <boost/thread.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/ref.hpp>
#include <boost/bind.hpp>
using namespace boost;
using namespace std;

#define BOOST_DATE_TIME_SOURCE
#define BOOST_THREAD_NO_LIB

// 模板类配合模板参数提供不同范围的计数，提供隐式类型转换操作
// 在多线程环境下安全计数
template <typename T>
class basic_atom: noncopyable {
private:
    T n;
    typedef boost::mutex mutex_t;
    mutex_t mu;

public:
    basic_atom(T x = T()):n(x) {}
    T operator++(){
        mutex_t::scoped_lock lock(mu);
        return ++n;
    }
//    T operator=(const T _n){
//        mutex_t::scoped_lock lock(mu);
//        n = _n;
//        return _n;
//    }
    operator T()    {return n;}
};

boost::mutex io_mu;

typedef basic_atom<int> atom_int;

void printing(atom_int& x, const string& str){
    for (int i = 0;  i < 5; ++i) {
        boost::mutex::scoped_lock lock(io_mu);
        cout << str << ++x <<endl;
    }
}

void to_interrupt(atom_int& x, const string& str){
    try {
        for (int i = 0;  i < 5; ++i) {
            this_thread::sleep(posix_time::seconds(1));
            boost::mutex::scoped_lock lock(io_mu);
            cout << str << ++x <<endl;
        }
    } catch (thread_interrupted& ) {
        cout << "thread_interrupted" <<endl;
    }
}

int main(int argc, const char * argv[]) {

    cout << "start" <<endl;
    this_thread::sleep(posix_time::seconds(2));
    cout << "sleep 2 seconds" <<endl;

    boost::mutex mu;
    try {
        mu.lock();
        cout << "do some operations" << endl;
        mu.unlock();
    } catch (...) {
        mu.unlock();
    }

    boost::mutex mu1;
    boost::mutex::scoped_lock lock(mu1);
    cout << "some operations" <<endl;

    atom_int x;

    thread t1(printing, boost::ref(x), "hello");

//    this_thread::sleep(posix_time::seconds(2));

    // join & timed_join
    if (t1.joinable()) {
        t1.join();          // 等待t1 线程结束再返回，不管执行多长时间
    }

    thread t2(printing, boost::ref(x), "boost");
    t2.timed_join(posix_time::seconds(1));      // 最多等待1秒返回

    thread t(to_interrupt, boost::ref(x), "interrupt");
    this_thread::sleep(posix_time::seconds(4));
    t.interrupt();
    t.join();

    return 0;
}

#include <iostream>
#include <string>
#include <boost/assign.hpp>
#include <boost/typeof/typeof.hpp>
#include <boost/assign.hpp>
#include <boost/thread.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/asio.hpp>
using namespace boost;
using namespace std;

int main(int argc, const char * argv[]) {
    using namespace boost::asio;

    try {
        io_service ios;

        ip::tcp::acceptor acceptor(ios, ip::tcp::endpoint(ip::tcp::v4(), 6688));
        cout << acceptor.local_endpoint().address() << endl;

        while (true) {
            ip::tcp::socket sock(ios);
            acceptor.accept(sock);

            cout << "client:" ;
            cout << sock.remote_endpoint().address() << endl;
            sock.write_some(buffer("hello asio"));
        }
    } catch (std::exception& e) {
        cout << e.what() << endl;
    }

    return 0;
}

#include <boost/python.hpp>
using namespace boost::python;

char const* greet()
{
    return "hello, world";
}

#include <boost/python.hpp>

BOOST_PYTHON_MODULE(hello)			// Python 模块开始
{
    using namespace boost::python;		// 打开命名空间
    def("greet", greet);
}

PYTHON_VERSION = 2.7
PYTHON_INCLUDE = /usr/include/python$(PYTHON_VERSION)

# location of the Boost Python include files and library
#  
BOOST_INC = /usr/local/include
BOOST_LIB = /usr/local/lib

# compile mesh classes
TARGET = hello

$(TARGET).so: $(TARGET).o
    g++ -shared $(TARGET).o -L$(BOOST_LIB) -lboost_python -L/usr/lib/python$(PYTHON_VERSION)/config -lpython$(PYTHON_VERSION) -o $(TARGET).so

$(TARGET).o: $(TARGET).cpp
    g++ -I$(PYTHON_INCLUDE) -I$(BOOST_INC) -fPIC -c $(TARGET).cpp

clean:
    rm *.so *.o

#!/usr/bin/env python
# -*- coding: UTF-8 -*-

import hello
print hello.greet()