Linux

1th Chapterthe composition of the computerCPU Hard Disk Memory power2nd ChapterMemoryMemory is a temporary storage file, data loss after power outageProgram: Write data to diskProcess: Running program read in memoryDaemon: A program that has been

Common commands1.lsList all files and folders under the directory2.pwdPrint out your current directory3../Execute the. sh File command4.ip AddrView IP Address5.sudo Service Network RestartRestart Network configurationCatalogue descriptionBin and

Common directivesLS Display file or directory-l list File details L (list)-a lists all files and directories under the current directory, including Hidden A (all)mkdir Creating a Directory-P Create directory, if no parent directory, create p (parent)

1. Errors such as newspaper/usr/lib/libreadline.so:undefined reference to ' PC '/usr/lib/libreadline.so:undefined reference to ' Tgetflag '/usr/lib /ibreadline.so:undefined reference to ' tgetent '/usr/lib/libreadline.so:undefined reference to ' up '

command: Find [option]Parameters:-type:f File D Directory-name: File or directory name-exec: What action to perform on the found result.e.g. find.   -type f-name ' abc.txt ' -exec {} \; {} represents what was previously found e.g. 　　　　find. -type f-

Riding, behind;Date command:We can come to man. Date command, which can be seen in the meaning of date-print or set the system date and time, we illustrate the date command from the following aspects.1. Show TimeDate[option] ... [+format]format :

PATH //Show your environment variable valuesPATH This is the variable name, ECHO is the command to display the information in the console$ here is the value of getting a variable, path is the variable nameTogether, the value of the PATH environment

SendEmail's homepage http://caspian.dotconf.net/menu/Software/SendEmail/Http://caspian.dotconf.net/menu/Software/SendEmail/sendEmail-v1.56.tar.gz#tar –ZXVF sendemail-v1.56.tar.gz#cd sendemail-v1.56#cp Sendemail/usr/local/binThen give confirmation

First, install the relevant library files required by the system before compiling the installation.#yum-y install gcc gcc-c++ make cmake libtool autoconf LibaioTwo. Download the corresponding dependent library and memcached source package1. Download

2.1 System directory Structure/root/.ssh/authorized_keys View Instructions Install tree command Displays the table of contents in tree form, showing two levelsLinux Common directory structure/bin to store frequently used commandsThe core file that

Famous pipes1. View command: Man 3 Mkfifo2. header file: #include #include 3. function prototype: int mkfifo (const char *pathname, mode_t mode);A, *pathname: name of the famous pipe such as:/home/gec/myfifoB, Mode: Octal permissions, for example: 07

Delete all the log files and directories under the $crs_home/log/$HOSTNAME/down, so that has not started, single-Step execution:Sh-x/ETC/INIT/OHASDPID of Strace-p OHASDView/var/log/messages, $ORACLE _home/log/$HOSTNAME/alert_$hostname.log, discover

Programming styleProgram programming to solve problemsThe instruction organizes the data, the instruction is stackedTo complete a complex taskSequential execution: Traversing execution, running one by oneSelect execution: There is a selection

Overview of the system boot process650) this.width=650; "src=" Https://s2.51cto.com/wyfs02/M02/9D/EB/wKiom1mIcWGj-YNyAAVcyvEhZiU774.png "title=" Screenshot from 2017-08-07 21-54-31.png "alt=" Wkiom1micwgj-ynyaavcyvehziu774.png "/>1. System Startup

1. OverviewIn Linux, type "man chattr", which is described as "chattr changes the file attributes on a Linux file system." From this we can easily draw: in the Linux file system, Chattr is able to change the properties of the file.2. Specific syntax

I. Introduction of SELinuxSELinux (Secure enhanced Linux) security-enhanced Linux is a new Linux security policy mechanism developed by NSA for computer infrastructure security. SELinux allows system administrators to be more flexible in defining

1. Some simple commands① Open File Command format:CD [Directory name]The directory name has a few symbols that have a special meaning, "..." Represents the Previous directory, the "~" represents the home directory, and "-" represents the preceding

Built-in judgment of linux shell and built-in judgment of linuxshell Built-in judgment: 0 is returned when the result is successful, and non-zero is returned if the result is unsuccessful. Test judgment Expression [Judgment Expression] note that

PASS Parameters through ShellWhen executing a Shell script, we can pass parameters to the script. The parameter format obtained in the script is $ n. N indicates a number. 1 indicates the first parameter for executing the script, 2 indicates the

Introduction to Kerberos Authentication principles and kerberos Authentication principles 1.1 What is Kerberos 1.1.1 IntroductionKerberos is a protocol used to authentication. It uses symmetric key encryption, which means that the key will not be