linux practice exam

First, homework (exercise) content:1, summarize the text editing tool vim use method;2, summarize the document Search command find use method;3, summarize the content of bash environment variable;4. Summarize the knowledge points of special permissions (SUID, SGID, Sticky) on Linux file system;5, summarize the Linux Disk Management, file system related knowledge points and the use of related commands;6, cop

number of files in two files and their total number of rows;8. Write a script(1) Prompt the user to enter a string;(2) Judgment:If the input is quit, exit the script;Otherwise, the string content of its input is displayed;9, write a script, print 2^n table; n equals the value entered by a user; (Sorry, I'm naughty)10, write a script, write a few functions: function 1, to achieve the sum of two numeric values, function 2, take a given two numeric value of greatest common divisor, function 3, ta

, recorded in the Linux environment, the use of tess4j steps and drip pits.The technical version used in this articleWhy should I emphasize the version separately? Long-term open-source pit comrades must understand a fact: most of the open source projects its quality (functional availability, document correctness, update timeliness) relatively general, in the circle, must have a lot of information in the quweicunzhen of the ability to cry out for atte

Linux and Security--linux Basic practice one, practice one: Master the maintenance method of the software source, configure the system to use the software source image in the education network. Master the method of finding, installing, uninstalling and updating software through the software source. 1. How to maintain t

This digest is "Developing and debugging Skills" in the book "Embedded Linux driver template explaining and project practice".The power of Linux is that there are many open source projects that can be used, and often many requirements can be quickly solved by looking for relevant open source modules. One of the key points to apply these open source modules to emb

This article extracts the "Embedded Linux Drive template simplicity and engineering practice" a book "Development and commissioning technology."Linux is powerful, there are so many open source projects can be used. It is often very much needed to be defined as a high-speed solution by finding the relevant source module. Make these open source modules embedded. Cr

parent process , of course, this practice yielded shared the physical space of the parent processSummary: A process is a subject, then it has the soul and body, the system must create the corresponding entity, soul entity and physical entity for implementing it. Both of them have corresponding data structures in the system, and the physical entity embodies its physical meaning.The traditional fork () system call directly copies all the resources to t

This digest from my my book fixing "embedded Linux driver template explaining and project practice"Initially it seems that Linux device driver development involves a lot of content, and the devices that need to be driven vary widely. Actually doing a time-driven look back looks mostly like the following points:(1) classify the drive. Which type of drive to genera

type parameter (that is, the received signal code), which itself is of type void, handler can also be the following two special values:sig_ign Shielding the signalSIG_DFL Restore default behaviorExample 1void handler (int sigNum) { cout RETURN VALUESignal () returns the previous value of the signal handler, or Sig_err on error.In the event of a error, errno is set to indicate the cause.int main (int argc, char *argv[]) { sighandler_t Oldhandler = Signal (SIGINT, handler); if (Oldhandle

This digest from my my book fixing "embedded Linux driver template explaining and project practice"Initially it seems that Linux device driver development involves a lot of content, and the need to achieve a wide range of drivers, in fact, after a period of time to drive back looks like the main points are:(1) Classification of the drive, first summed up as which

(Sigaction (Sigrtmin, act, NULL)! =0) {printf ("sigaction () failed!\n"); return-1; } intret=0; //wait for child process while(1) {ret=Wait (NULL); printf ("Child process pid=%d\n", ret); if(ret==-1) { if(errno==eintr) { Continue; } Break; } } //freeing the shared memory area if(Shmctl (Shmid, Ipc_rmid, NULL)! =0) {printf ("shmctl () failed!\n"); } printf ("game is over!\n"); return 0;}/** ERROR Summary: GDB error: Shmat () err:invalid

Introduction to Linux Systems This section mainly introduces the Linux desktop environment, Linux terminal. Through the practice of the use of Common shell commands, shortcut keys, wildcard characters, using small tricks and other operations.1.linux Desktop Environment

Article Title: How Linux experts "practice. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Now is the time to use Linux. 　　 This free o

Linux C programming practice (2 )?? File System Programming 1. Linux file system Linux supports multiple file systems, such as ext, ext2, minix, iso9660, msdos, fat, vfat, and nfs. At the upper layer of these specific file systems, Linux provides a virtual file system (VFS)

Linux Shell script programming learning notes and practice, Script Programming learning notes Http://www.1987.name/141.html Shell Basics Terminal printing, arithmetic operations, common variables Search for specific strings in a specified directory in Linux and highlight matching keywords Obtain the standard input [read command] from the keyboard or file Fil

C programming practices in Linux (III) -Process Control and Process Communication Programming 1. Linux Process A Linux Process contains three parts of data in the memory: code segment, stack segment, and data segment. The code segment stores the code of the program. Code segments can run multiple Process sharing. The stack segment stores the return address of th

, if its UID is 0, this is displayed as an administrator;2, otherwise, it is displayed as a normal user;#!/bin/bash2 #program3 # Practice Determining if a user is root4 #history5 #time 2016-10-19-9:386 Path=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bash7 Export PATH8 Username=user19 userid= ' Id-u $USERNAME '[$USERID-eq 0] echo "$USERNAME is Admin" | | echo "$USERNAME is command"3, practice