If Statement In Linux

I. Introduction We often see some similar in the program disassembled code 0 × 32118965 this address, the operating system called linear address, or virtual address. What is the use of virtual address? Virtual address is how to translate into physical memory address? This chapter will give a brief account of this. 1.1 Linux Memory Addressing Overview Modern operating systems are in 32-bit protected mode. Each process can generally address 4G of physical space. But our physical memory is generally hundreds of M, the process can get 4 ...

You can use the flexibility inherent in the command shell of Linux to create scripting languages that help you simulate DOS commands in a Linux environment. 　　 　　The specific approach is as follows. If you are an IT support expert, you like the command of Windows very much, when you first use the Linux command line, you may soon find yourself confused. The DOS commands you've been familiar with for a long time don't exist in Linux. So you will find yourself facing a terrible task: to learn and be familiar with the whole ...

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Network Time Protocol (NTP) is a protocol that is used to help the Linux system clock synchronize with the exact time source. Allow all sites on the web to sync time. Divided into two categories: * 1th: The NTP site uses the clock timing. * Class 2nd: NTP sites and smaller exact time sources. (NTP sites with slightly pager accurate time sources) This practice has the advantage that at least one server becomes a local server on your network, serving other devices. (This ...

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Sometimes in order to install the latest version of the Nginx, do not want the system with the old version of Nginx trouble, you need to remove it. Many times the machine room to configure the machines have installed their own nginx, the version is very old, running up already accounted for 80 ports, very annoying. The following method tells you how to clean delete http://www.aliyun.com/zixun/aggregation/33836.html ">debian Linux system with Nginx." Note that the first preparation ...

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February 10, closed the door of the locked central red Flag in Beijing, a new announcement was pasted on the gate, which completely cracked the hope that those who still stick to the company's work "Save China Red Flag". The bulletin said: "Because of Beijing Red Flag Software Technology Co., Ltd. operating serious difficulties, the board of directors on December 13, 2013 to dissolve the company from now on, and set up a liquidation committee in accordance with the law of the company liquidation." 　　January 22, 2014, a liquidation Working group has been set up, which is responsible for and carries out relevant liquidation work. 13th, 21st century economic reporter ...