解决Python多进程变量共享问题

本文将介绍在Linux环境下，让用户不能远程登录 只能使用scp命令

ProductivitySynapseWe love app launchers and the speed they bring to our workflow, and they can doa lot more than just launch apps. Unfortunately, app launchers are in a weird spot in the Li

One of the Linux command line tools I had initially under-estimated is netcat or just nc. By default, netcat creates a TCP socket either in listening mode (server socket) or a socket that is used in

Using cURL to automate HTTP jobs Related:curl man pageManualFAQHTTP Scripting1.1 Background1.2 The HTTP Protocol1.3 See the Protocol1.4 See the Timing1.5 See the ResponseURL2

#include #include int main(void){    while(1)    {        printf(".");        fflush(stdout);        sleep(1);    }    return 0;}

ffmpegand ffserver user guide1.Installation1)、安装git。在命令行下运行$sudoapt-get install git-core2)、下载最新版本的ffmpeg$gitclone git://source.ffmpeg.org/ffmpeg.git ffmpeg3)、进入ffmpeg目录下，

Using sar you can monitor performance of various Linux subsystems (CPU, Memory, I/O..) in real time.Using sar, you can also collect all performance data on an on-going basis, store them, and do hist

If you haven’t used tmux, you should probably give it a try.  It is an elegant and full featured terminal multiplexer similar toGNU Screen.If life were easy you would simply fire up yum and instal

Docker is an open-source project that makes creating and managing Linux containers really easy. Containers are like extremely lightweight VMs – they allow code to run in isolation from other container

// Examples for using socat (and filan)//"$" means normal user, "#" requires privileges, "//" starts a comment///////////////////////////////////////////////////////////////////////////////// si

一、背景系统管理员经常需要SSH 或者telent 远程登录到Linux 服务器，经常运行一些需要很长时间才能完成的任务，比如系统备份、ftp 传输等等。通常情况下我们都是为每一个这样的任务开一个远程终端窗口，因为它们执行的时间太长了。必须等待它们执行完毕，在此期间不能关掉窗口或者断开连接，否则这个任务就会被杀掉，一切半途而废了。二、简介GNU Screen是一款由GNU计划开发的用于

curl vs Wget This document started off as a blogentry, but I decided that I should better make a permanent home for thisas I'm sure I'll get reasons to update and fix this as time goes by.The

PHP PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML.  For more information on PHP, visit their website at

curl 是Linux下一个强大的http命令行工具。使用例子如下：1 输出到屏幕curl http://www.google.com2 输出到文件curl -o google.pnghttp://www.google.com.hk/intl/zh-CN/images/logo_cn.png3 输出到文件，并使用与服务器相同的文件名curl-O http://www.g

1. Copy file from container to hostdocker cp :/file/path/within/container /host/path/targetExample:$ sudo docker cp 8af19f753c85:/etc/network/interfaces .2. Copy file from host to

In the afternoon, we tried to setup a reverse ssh tunnel from surveillance room to server room.But after we  typed in the command, we get no response from the server.From the captured packet of wi

[ apt-get build-dep ]apt-get build-dep command installs required packages to build a package from a source code.apt-get build-depbuild-dep source_pkgCauses apt-get to install/r

Often referred to as the "swiss army of knife" for TCP/IP networking, Netcat is an extremely versatile Linux utility that allows you to do anything under the sun using TCP/UDP sockets. It is one o

Goal:Camera Discovery and Streaming RetrievalOpenOnvifInstallation GuideStep:1.获取OpenOnvif源代码gitclonehttps://github.com/sigrand/OpenONVIF.git2.安装gsoap，要求版本2.8.15及以上http://c

This article is part of the on-going 15 example series where 15 examples will be provided for a specific command or functionality. In this series, earlier we discussed aboutfind command, crontab

Network monitoring on LinuxThis post mentions some linux command line tools that can be used to monitor the network usage. These tools monitor the traffic flowing through network interfaces and meas

1. Enter copy modectrl+b [2. Start select textctrl+@  or ctrl+space or space3. End select and copyalt+w or enter4. Pastectrl+b ]

1. remove old version libevent$sudo yum remove libevent* 2. compile and install new version libevent$wget https://codeload.github.com/libevent/libevent/tar.gz/release-2.0.21-stable$tar

General UseUbuntu/Kubuntu/etcOne of the most popular general-use distributions with one of the largest selections of software. Based on: Debian FedoraThe most cutting-edge general-use di

Are you a Windows XP user needing to upgrade your operating system? Do you dislike the idea of Windows 8, or are you hesitant to spend any money? For many people, installing a Linux operating system o

I came across a problem recently, I needed to configure a Cisco switch and all I had was a Ubuntu machine that had a serial port. Since then I've got a Cisco 2511, with octal cable, which is very hand

Most embedded Linux / BSD systems such as routers, servers and nas devices comes with console interface (serial port with RS-232). BIOS can uses this, and after boot BIOS screen I/O is redirected so t

am a new Linux and Unix user. How do I change the root directory of a command? How do I change the root directory of a process such as web-server using a chroot command to isolate file system? How do

I tried to explain what "chrooting" is to a group of starting Linux gurus. It seemed rather difficult to explain. So, maybe an illustrated article will explain what chroot is.From chroot's manpage:

How do I display all my environment variables using bash shell on RHEL / Debian / Ubuntu / CentOS / Fedora / Mint Linux operating systems?You can use any one of the following command to display th

The modern art of computer programming combines a special kind of human personality with a special set of tools to produce a rather ghostly product -- software -- that other human beings find useful.

I am a new Linux and Unix shell user. How do I Remove or delete jobs from current bash / ksh or POSIX based shell?Job control is nothing but the ability to stop/suspend the execution of processes

Often, when you log into your Linux VPS, you are looking to get some work done. However, no one can claim that the thousands of developers who create the software available on a typical Linux machine

ss是Socket Statistics的缩写。 顾名思义，ss命令可以用来获取socket统计信息，它可以显示和netstat类似的内容。但ss的优势在于它能够显示更多更详细的有关TCP和连接状态的信息，而且比netstat更快速更高效。【和netstat说再见的原因】 当服务器的socket连接数量变得非常大时，无论是使用netstat命令还是直接cat /proc/net/t

The modern art of computer programming combines a special kind of human personality with a special set of tools to produce a rather ghostly product -- software -- that other human beings find useful.

I’ve compiled 25 performance monitoring and debugging tools that will be helpful when you are working on Linux environment. This list is not comprehensive or authoritative by any means.However this

There are two ways to create an SSH tunnel, local and remote portforwarding (there’s also dynamic forwarding, but we won’t cover thathere). The best way to understand these is by an example, let’s sta

CentOS安装支持组件：1yum installlibevent-devel ncurses-devel安装tmux：123456wget http://downloads.sourceforge.net/tmux/tmux-1.6.tar.gzta

The xargs command is extremely useful when we combine it with other commands.This tutorials explains the usage of xargs command using few simple examples. These example will help you understand th