linux practice exam

interrupt wait. Write 0 Clear flag.The generation and processing of interrupts is explained in detail in the 488-page low-end Comment:As above, by the 2nd, the interrupt source has 3:1 bytes (8bit) of data sent or received, the host (at this time the 2,440-bit slave) call or slave (2440 host) address to the address sent by the host match; arbitration failure (specific follow-up instructions).Combined with interrupt and host send, receive block diagram, the agreement has a whole grasp, now the p

System ubutnu12.04-php 5.2General steps:Download the corresponding PHP version of the extension sourceUnzip and enter the directoryPerform phpize precompilation (generic and PHP execution files in one directory)./configure--with-php-config=php Path/php-config (If an error occurs installing autoconf)Make MakeinstallConfiguring the php.ini file to open the corresponding extensionRestart PHP Service (PHP-FPM or Apache)——————————————————————————————Lifting Li:Now compile and install the MySQL exten

Tags: regular practiceRegular practice1.通过awk获取IP地址[[emailprotected] ~]# ifconfig eth2 | grep inet inet addr:10.3.151.25 Bcast:10.3.151.255 Mask:255.255.255.0 inet6 addr: fe80::250:56ff:fe80:6e7e/64 Scope:Link[[emailprotected] ~]# ifconfig eth2 | grep "\binet\b" inet addr:10.3.151.25 Bcast:10.3.151.255 Mask:255.255.255.0[[emailprotected] ~]# ifconfig eth2 | grep "\binet\b" | awk ‘{print $0}‘ inet addr:10.3.151.25 Bc

[Email protected] ~]#/w29.sh 2/12.00[Email protected] ~]#/w29.sh 10/52.00[Email protected] ~]# VI w29.sh[Email protected] ~]#[Email protected] ~]#./w29.sh./w29.sh:line 3:syntax error near unexpected token ' fi './w29.sh:line 3: ' fi [$#-ne 3]; Then[Email protected] ~]# VI +3 w29.sh[Email protected] ~]#[Email protected] ~]#./w29.shPlease input 3 parameter[Email protected] ~]#30. Ask for the sum of all even numbers within 100 and the sum of odd numbers.For:#!/bin/bash#Sum1=0Sum2=0For I in $ (SEQ 1

tle | | echo "Error"For:If the little user and his or her home directory do not exist, the output "Error", or delete the user, and his home directory, the loop delete.If the little user and his or her home directory do not exist, create the user and force the creation of their home directory/home/little; otherwise output "Error"Useradd command:-D: Create home directory-M: Create User with home directoryCases:[[email protected] ~]# LS/Backup boot etc lib lost+found misc net proc sbin SRV tmp var

Basic principles and practice of Linux C programming (2018-06-16-19:12:15)Basic principles and practice of Linux C language programmingEfficient learning with Purpose: what to do and how to use itRe-knowledge of C language C language is a universal, process-oriented programming language, which is widely used 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

interface (the current mainstream interface is the SATA interface, older hosts use the IDE interface).IDE Devices: Devices connected to the IDE interface, including disk and optical devices.In the IDE interface, the host will typically provide two IDE interfaces, and an IDE flat cable can connect two IDE devices, so up to four IDE devices can be connected. In other words, if we already have a CD-ROM device, then we can only connect the disk with three IDE interfaces at most. These two IDE inter

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]

Disk MBR partitioning in Linux--Practice of FDISK command syntaxFDISK (options) (parameters)Options-b l 列出分区表信息-v 显示版本信息ParametersDevice files: e.g./DEV/SDAInstanceSelect the disks you want to manipulate:[root@vathe ~]#fdisk /dev/sdbEnter m to list the commands that can be executed:Command (M forHelp):McommandAction A toggle a bootable flag B edit BSD DisklabelC Toggle the DOSC

some time ago also learned a lot of network-related knowledge, but also through a variety of practices. But it never starts with a real workout from scratch. Please try it today. The following is a detailed record of this process. This includes a partial understanding of the network and a record of the problems encountered. Practice Content and Purpose:1, using the bridge mode, the multiple Linux virtual ma

Signal ClassificationUnreliable signalThe Linux signaling mechanism is basically inherited from Unix systems. The signaling mechanism in the early Unix system was relatively simple and primitive, and later exposed some problems in practice, and its main problems were:1. Each time the process processes the signal, the response to the signal is set to the default action. In some cases, it will cause error han

Introduction and practice of special permission bits for Linux files and directoriesIn Linux, both Superuser root and normal user can use the command "passwd" command to modify their password, but everyone who knows Linux know that the Linux password is stored in the /etc/pa

disks. It divides all the hard drives into two groups, becoming the lowest combination of RAID 1, while the two groups of hard disksEach is considered RAID 0 operation when RAID 10 has one hard drive damaged, the remaining drives will continue to operate. Raid 01 Only one hard drive is damaged, and all hard drives in the same group of RAID 0 will stop functioning.Only other groups of hard drives are operating with less reliability. If you build raid 01 with six hard disks, and then use three RA

return value.3.shell variable Quantum string knowledge650) this.width=650; "Width=" 720 "height=" 305 "title=" 1.png "style=" width:720px;height:305px; "alt=" Wkiol1j4d1jcztx-aafomugkd9o187.png "src=" https://s5.51cto.com/wyfs02/M01/91/B9/ Wkiol1j4d1jcztx-aafomugkd9o187.png "border=" 0 "vspace=" 0 "hspace=" 0 "/>Tips:The colon of the expression in the above ID 11-14 can be omitted, and if the colon is omitted, the "empty or Unassigned" section in each definition is changed to "Unassigned".For e

* * *******************/#include#include#include#includestring.h>#include#includeMain () {intpipe_fd[2]; pid_t pid; Charr_buf[ -]; Charw_buf[4]; Char*P_wbuf; intR_num; intcmd; memset (R_buf,0,sizeof(R_BUF)); memset (W_buf,0,sizeof(R_BUF)); P_wbuf=W_buf; if(Pipe (PIPE_FD) 0) {printf ("Pipe Create error\n"); return-1; } if((Pid=fork ()) = =0) {printf ("\ n"); Close (pipe_fd[1]); Sleep (3); R_num= Read (pipe_fd[0], R_buf, -); printf ("Read num is%d the data read from the pipe is%d\n", R_n

connection, has a queue size of Back_log, limited to OS parameters Default-character-set=utf8 Encoding format Max_allowed_packet Limit the size of packets accepted by the server Skip-name-resolve Prohibit Domain name resolution Event_scheduler = On MySQL-enabled transactions (off off) 8. Restart MySQL Service /etc/init.d/mysqld restart 9. Precautions Flush privileges is required after setting up the u

thread and the child thread pass data typedef struct _student{ char name[20]; unsigned int age;} Student;void *threadfunction (void *args) { cout Pthread_cancelTo cancel a thread in executionint Pthread_cancel (pthread_t thread);Return value: Successful return 0, failure return error code;Pthread_detachDetach a thread-if the main thread does not end at the end of the newly created threads and does not call Pthread_join, a zombie thread is generated, and the second problem can be resolv

scripts may also switch directories[Email protected]:~$ pushd/var/www/html/var/www/html ~[email protected]:/var/www/html$The above command saves the current directory to memory and then switches to the requested directory. Once poped is executed, it will remove the saved directory location from memory as the current directory[Email protected]:/var/www/html$ popd~[email protected]:~$14. Switch to a directory with a blank name[Email protected]:~$ cd test/tecmint/[email protected]:~/test tecmint$O

later,The key now is to understand the idea.Cleans up the atomicity of blocking and non-blocking reads and writes.Therefore, there is no one model is the absolute standard, must integrate the business scenario requirements./***************** * * test.c* *******************/#include#include#include#include#includestring.h>#include#include#defineFifo_server "/tmp/fifoserver"Main (intargcChar**argv) { intFD; Charw_buf[4096*2]; intReal_wnum; memset (W_buf,0,4096*2); if(Mkfifo (Fifo_server, o_cre