Linux

I don't want to explain the problem with some abstract concepts here. I just want to express my thoughts as accurately as possible in plain languages. Optimization. Why? If you say a system needs to be optimized, what are your criteria? There are

Crontab is a convenient way to regularly (cyclically) execute a task on Unix/Linux systems.Program Use the cron service and use the service crond status to view the cron service status. If it is not started, the Service crond start starts it,

When the file system is damaged, if the ext2fs file system is used, you can run the e2fsck command from the floppy disk to correct corrupted data in the file system. For other types of file systems, you can use the corresponding fsck command. When

I. Lib type:And static library in Windows (. lib) and dynamic library (. DLL), Linux also has a static library (the static library file suffix is. a) and shared library (shared library file suffix. so). the/usr/lib directory contains both the static

First, check the usage of the virtual memory and use the command# FreeView the memory usage of the current system.In general, Linux's physical memory is almost completely used. This is very different from windows. Its memory management mechanism

Linux is very good. It occupies low system resources and can run smoothly on low-end machines. However, it may occasionally encounter annoying problems like windows, that is, the CPU usage of processes is.Recently, I encountered this problem.

Cat C a t is a simple and General Command that can be used to display the file content and create a file. The general form of c a t command is:Cat [Options] filename1... filename2... If you want to display a file named m y f I l e, you can use:$ Cat

Background command: & Commands When running a job on the foreground, the terminal is occupied by the job, but it does not occupy the terminal when running the job on the background. You can run the job in the background using the & command. The

When extracting or filtering text from a file or command output, you can use a regular expression (r e), which is a set of special or not special string modes. Table 7-1 Basic metacharacters and their meanings^ Match only the beginning of a row$

Prepare makefile (for conversion) From [region This article introduces the basic knowledge required for C Programming in Linux. In this article, we will learn the following: Source program Compilation Write makefile Library Link Program

1. Learn to write simple makefile 2. Compile an application and run it with makefile. 3. Learn to write the driver makefile 4. Write a simple char driver. The makefile is compiled and can be insmod, lsmod, or rmmod. Print Hello world in the init

Cd ~ : Enter the Home Directory of the user.Mkdir/home/testtan: Create the/home/testtan directory,Rmdir dirctory: Delete the corresponding directory,MV test4_4.c test4_4: Rename test4_4.c to test4_4,[Spsn @ localhost testtan] $ CP sum. C ~ /Test/tan_

From: http://www.chinaunix.net/jh/4/615686.html Linux memory management, in fact, is very similar to Windows Memory Management, all of which use the concept of virtual memory. Speaking of this, we have to scold ms, why do we still use pagefile when

SAR-N {Dev | EDEV | NFS | nfsd | sock | all} SAR provides six different syntax options to display network information. The-N option uses six different switches: Dev | EDEV | NFS | nfsd | sock | all. Dev displays network interface information, EDEV

At is the first choice for deploying one-time scheduled tasks in Linux. Use the following options: Usage: At [-V] [-q x] [-F file] [-M] TimeAt [-V] [-q x] [-F file] [-M]-T [[CC] YY] mmddhhmmAt-C job [job...](ATQ | at-l) [-V] [-q x](Atrm | at-d | at-

In an 80x86 microprocessor-based computer, the memory addressing conversion process is: Logical Address → linear address (Virtual Address) → physical address. MMU (Memory Management Unit) involved in memory addressing has two important parts:

Linux 2.6 has different kernel driver modules than previous versions. You can read the files in document/kbuild to learn more. In this paper, a simple description of the process of compiling and loading the Linux 2.6 Driver Module (assuming that the

Process switch is an important function in preemptible multi-task OS. In essence, the OS Kernel suspends the running process, then, resume the previous suspended process B.  Hardware context Each process has its own address space, but all processes

Recently, I have been tossing over Linux. I am used to the dummies of windows. I am not very familiar with suddenly entering the Black-White Linux World. Because the programs that need to run on Linux usually run on the server for a long time, and

Linux variables can be divided into two types: environment variables and local variables Environment variables, or global variables, exist in all the shells. When you log on to the system, you have the corresponding system-defined environment