linux practice test

Summary:Based on the list definition of the Linux kernel, this paper attempts to complete the related interface design, and constructs the test case to realize the usage of the list interface.Body:Let's start by looking at the list interfaces provided by the Linux kernel as follows:struct head_node{struct head_node* pre;struct head_node* next;};That is, there are

Title: Implement two programs mysignal, Mycontrl,mycontrl to mysignal send SIGINT signal, control mysignal whether the screen print "Hello" string.//Capturing signals#include#include#includestring.h>#include#include#includeintflag=0;voidCatch_sig (intSign ) { Switch(sign) { CaseSigint:flag=flag==0?1:0; Break; CaseSigalrm:exit (0); }}intMysignal (intSignvoid(*func) (int)){ structsigaction act,oact; Act.sa_handler=func; Sigemptyset (act.sa_mask); Act.sa_flags=0; returnSigaction (sign,act,o

%d\n", Resid); return 0;}. Suffixes:.c. OCC=gccSRCS1=CREATESHM.CSRCS2=WRA.CSRCS3=RDB.CSRCS4=rmshm.cobjs1=$ (srcs1:.c=. O) OBJS2=$ (srcs2:.c=. O) OBJS3=$ (srcs3:.c=. O) OBJS4=$ (srcs4:.c=. O) EXEC1=firstsEXEC2=nextsEXEC3=lastsEXEC4=lasts2start:$ (OBJS1) $ (OBJS2) $ (OBJS3) $ (OBJS4) $ (CC)-o $ (EXEC1) $ (OBJS1) $ (CC)-o $ (EXEC2) $ (OBJS2) $ (CC)-o $ (EXEC3) $ (OBJS3) $ (CC)-o $ (EXEC4) $ (OBJS4) @echo"^_^-----OK-----^_^". C.O: $ (CC)-WALL-G-o [email protected]-C $Clean:rm-F $ (OBJS1) RM-F $ (OBJ

forcibly compress the file. Ignores the existence of a file name or a hard connection and whether the file is a symbolic connection.-H or--help online Help.-L or--list lists information about the compressed file.-L or--license display version and copyright information.The original file name and time stamp are not saved when the file is compressed by-N or--no-name.-N or--name compress the file, save the original file name and time stamp.-Q or--quiet does not display a warning message.-R or--recu

Copyright Notice: This article from Fat Meow ~ blog, reprint must indicate the source. Reprint Please specify source: http://www.cnblogs.com/by-dream/p/5784288.htmlObjective The previous article mainly on how to use JMeter under the Windows system for stress testing, but found some problems, when the QPS reached a certain peak, due to the Windows machine itself bottlenecks caused by the network card can be compressed, in addition to the formal environment, Development wants to

: Read file map **/int main (int Argc,char **argv) {if (argc! = 2) err_quit (" usage:. main Map Note points:1. Memory mapping cannot (and cannot) change the size of the file;2. The valid address space available for interprocess communication is not entirely limited to the size of the mapping file, but should be based on the size of the memory page (see test below);3. Once the file is mapped, all access to the mapped area is actually access to the memo

:/usr/local/bin:/usr/local/sbin:~/bashExport PATHDeclare-i sum=0For I in {1..100}; DoLet remainder= $I%3If [$REMAINDER-eq 0]; ThenLet sum= $SUM + $IFiDoneecho "$SUM"Exercise Three:Write a scriptShows all default shell-bash users and default shell-/sbin/nologin users on the current system, respectively.and statistics of the total number of Shell users, showing the results are as follows:Bash,3users,they Are:root,redhat,gentooNologin,2users,they are:bin,ftp#!/bin/bash#program:#显示当前shell下面的用户#histo

first 3 characters per lineThe sed '/east/,/west/s/north/south/' Filex replaces the north of all rows from east to west with SouthSed-n '/time off/w timefile ' Filex writes all rows containing time off to the Timefile fileSed ' s/\ ([oo]ccur\) ence/\1rence/' file replaces all occurence with occurence,occurenceSed-n ' | ' Filex print all \nn display nonprinting characters, TAB key (tab) is displayed as a > line [Root@linux ~]# sed [-NEFR] [action]

address from a terminal prompt. Learn to start and stop the X Server. When the X server was stopped, you had a text mode only operating system, which was ideal for server deployment. When it's running you had an opportunity to try some of the available IDEs that run on Linux. Optional: Learn some python and learn to write simple Web server applications with Python. (I do not recommend bothering to learn PHP, if you don't like a Python then look i

First, the Linux basic Practice 1.11. Master The maintenance method of the software source, configure the system to use the software source image. Master the method of finding, installing, uninstalling and updating software through the software source. This part of the content in many seniors study Sister's report has a very detailed explanation, I do not repeat here.1.21. Master the concept of

Linux inter-process communication (IPC) Programming Practice (9) System V semaphores-A toolset for encapsulating a semaphores operationMain API # include # Include # Include Int semget (key_t key, int nsems, int semflg );Int semctl (int semid, int semnum, int cmd,...); int semop (int semid, struct sembuf * sops, unsigned nsops ); SemgetInt semget (key_t key, int nsems, int semflg);/** Example 1:

users have write permission files;find/etc/init.d/-perm-111-a-perm-00218, so that ordinary users can use/tmp/cat to view/etc/shadow files;chmod U+s/tmp/cat19, create the directory/test/data, let a group of ordinary users have write permission to it, and all the files created by the group of directories belong to the group, in addition, each user can only delete their own files;Mkdir/test/data New Directory

=" Http://s1.51cto.com/wyfs02/M02/85/4F/wKiom1ef9tGxmUcNAAAbYM0Vc4w963.png "title=") zqq~ g39% ($2[hl%rzfwv (3.png "alt=" Wkiom1ef9tgxmucnaaabym0vc4w963.png "/>10. Display each word (letter) in the file in a separate line with no blank linesCat File.txt | Tr-s "" \ n "650) this.width=650; "src=" Http://s4.51cto.com/wyfs02/M02/85/4F/wKiom1ef7CjzaaxcAAAZ7QtQV3s080.png "title=" D1vy6) ({{u8s__ ' r36dw6.png "alt=" Wkiom1ef7cjzaaxcaaaz7qtqv3s080.png "/>1. Create TestUser UID 1234, main group: Bin, Au

) this.width=650; "src=" Http://s4.51cto.com/wyfs02/M01/79/BD/wKioL1aaFgyzqgUwAAAhpWUiLqI409.png "style=" float: none; "title=" 7.png "alt=" Wkiol1aafgyzqguwaaahpwuilqi409.png "/>7 , one day the system was invaded, hackers in your system to leave the Trojan file:You now need to find all the files on the current system that are not owned by the master or group and have been visited in the last week;In addition, it is necessary to find all files of more than 20k and type ordinary files in/etc dire

Linux signal Programming Practice (3) Signal Representation in the kernel (sigaction sigqueue) Representation of signals in the kernel The processing action of the actually executed signal is called the Delivery, the State between the signal generation and the Delivery, and the Pending ). A process can Block a signal. When a blocked signal is generated, it remains in the pending state until the process unb

Tomcat default portCd/usr/local/tomcat/confVI server.xml Search 8080, find the following section configurationChange 8080 to 80 and restart the Tomcat service when you're done.Five, add a virtual host to Tomcat,1,vi Server.xml, find Host name= "www.test.com" appbase= "/data/tomcatweb"Unpackwars= "false" autodeploy= "true"Xmlvalidation= "false" Xmlnamespaceaware= "false" >，Save exit, close Tocat, and start Tomcat.2, create AppBase mkdir-p/data/tomcatwebVi/data/tomcatweb/index.jsp (Write a time f