liberty basic commands

Target connection name Hard link: Two or more names (shortcut link names) are created for each disk. The relationship between the names is hard link. Basic Format: ln connection target connection name Other common commands Copy: CP [-Option] source file target file Option: CP-f Source File target file: Forced overwrite, no information is promptedCP-I source file target file: Forced overwrite with pro

Reddy,sysadmin104,anand Ram,developer105,jane Miller,sales Manager[[email protected] ~]# sed '/^$/d ' employee.txt101,john Doe,ceo102,jason Smith,it Manager103,raj Reddy,sysadmin104,anand Ram,developer105,jane Miller,sales Manager⑥ Delete all comment lines (assuming that the comment lines start with #)Syntax: sed '/^#/d ' {input-file}V. Write the contents of the schema space to a file (command W)The W command can write the contents of the current pattern space to a file, with the same usage as

line, Ctrl+e: The cursor moves to the end of the command, Ctrl+u: from the position of the cursor to the beginning; Ctrl + Z: Put the command in the background; R: Search from the historical command;Historical commandHistory [-CW] [Historical command Save file];-C: Empty History command;-W: Write History command in cache to history command save file ~/.bash_historyStandard output redirectionCommand > file to overwrite the correct output of the command to the specified file or deviceCommands >>

, if you create a password and do not create a directory, the user log on as the home directory, not writable.AddUser for interactive, create a user to create a password at the same time, create directory;Groupadd group name Create a new group PASSWD username user-created password passwd-d user name Delete user password can also login passwd-s user name query account password usermod-l new username old user name rename user userdel–r user Name Delete User everythingThe

directoriesLs-l/bin/login file Propertiesls-ld/etc/ Directory Properties(2) Change of file ownership:chown and chgrpsudo chown lewis:root days to Change The owner of the file days to Lewis, the group to the root Group (3) sudo chown guest days only changes the owner(4) sudo chown:nogroup days change the genus group to Nogroupandretain the master setting(5) sudo chown-r Lewis iso/ will iso/ and all of its files to the user Lewis(6) Linux provides a single command chgrp to set the genus of the f

The following articles mainly describe the basic MySQL commands. We will divide them into five parts to describe them in detail. It can be said that each part is very important, the following is a description of the basic MySQL commands. MySQL basic

FFmpeg Common basic Commands (RPM) "FFmpeg" FFmpeg common basic commands 1. Separating the video audio stream Ffmpeg-i input_file-vcodec Copy-an output_file_video//split video stream ffmpeg-i Input_file-acodec copy-vn output_file_audio/ /Separate audio streams 2. Video re-use Ffmpeg–i test.mp4–vcodec copy–an–f m4v te

There are many installation tutorials for installing Git online, so you can refer to them. Here is the version of Git with Windows, click here to download. After the basic setup is complete, you can see the new git commands added by right-clicking the mouse button: Git GUI here and git Bash here. Here we use the command-line tool to do some basic git setup. 1, us

represented as 2So the permission to manipulate this file is represented by a value of 662Change permissionssudo chmod [u belongs to user g belongs to group O Other User a All users] [+ Increase permissions-reduce permissions] [r W x] directory nameFor example: There is a file filename, the permission is "-rw-r----x", the permission value is changed to "-rwxrw-r-x", with a numeric representation of 765sudo chmod u+x g+w o+r filenameThe above example can be represented by a numerical valuesudo c

instructions we use, ls,cd,pwd.The shell translates the instructions we send into a language that the kernel can understand, and then implements the instructions.We interact with the Linux kernel through the shell!The format used for commands in Linux systems is:command [options] [parameters]such as: Ls-a/HomeIndicates that all files are listed in the/home directoryLS stands for command list ' list '-A description command ls, listing all files/Home D

"style=" Float:none; "title=" 20.png "alt=" Wkiom1eu1dobqkgxaabdd7otcqa206.png-wh_50 "/>12. Select the system form you want to install. In order: Desktop system, minimized desktop system, minimal installation, basic service installation, database server, Web server, virtual host ... Choose a desktop installation here. After clicking Finish, the system will start to install, after the installation is completed, click on the reboot reboot to use.650) t

Linux Study Notes 2-linux basic commands and Study Notes 2-linux First blog: linux Study Notes 1-ubuntu installation and basic settings, has introduced how to install the linux operating system and some basic settings and modifications. This blog introduces some basic Conso

1. Command prompt user@ubuntu-hansee:~/test$ global variable PS1 ps2 echo $PS 1: \[\e]0;\[emailprotected]\h: \ w\a\]${debian_chroot:+ ($debian _chroot)}\[emailprotected]\h:\w\$ echo $PS 2: > A few basic hints meaning: \u: User \h: local hostname \w: Current working directory name \T:24 hour time \t:12 hour system Modify the command prompt for the current terminal Direct assignment: ps1= "[\t][\u]$" Modified effect--[09:46:09][user]$

include multiple servers for multiple users to access. In addition, the peer-to feature allows some systems to play the dual role of the client and server. HBase is a distributed, column-oriented, open-source database that comes from the Google paper "Bigtable: A distributed storage system of structured data" written by Fay Chang. The Yonghong Data mart is a software that is based on proprietary technology developed for the storage and processing of information. Yonghong Data Mart's Distributed

emp where job= ' job ';2.editDescription: The command can edit the specified SQL scriptCase: Sql>edit D:\a.sql3.spoolNote: This command can output the contents of the Sql*plus screen to the specified file.Spool D:\b.sql and enter spool offDisplaying and setting environment variablesOverview: Can be used to control the output of various formats, set show if you want to permanently save the relevant settings, you can go to modify the Glogin.sql script1.linesizeDescription: Sets the width of the d

The following articles mainly introduce you to the basic DB2 commands and related knowledge that you must master as a beginner in DB2 database learning. We all know that you are in the DB2 database getting started course, some friends mentioned this question, and experts answered it and compiled it to help other friends learn and master it. Common DB2 commands Da

Basic LINUX commands-general Linux technology-Linux technology and application information. For details, refer to the following section. This document is very practical. It is not about the specific meaning of a command parameter, but about what commands are required to complete the task from the perspective of actual work. File System operations are the most

Git basic commands and GitFlow Workflow This article explains some basic team collaboration commands of Git and GitFlow workflow guide.Git team collaboration commands 1. Open BranchGit branch new branch name, for example, under the master branch, a New Development branch:

This article mainly introduces the installation of MySQL and the basic management commands and settings, which are the basis for building the MySQL environment. For more information, see Install MySQLInstall Mysql on Linux/UNIXOn Linux, we recommend that you use the RPM Package to install Mysql. MySQL AB provides the following RPM packages: MySQL-MySQL server. You need this option unless you only want t

Commands are divided into internal commands and external commandsPriority: alias-internal command-hash-external commandThe common basic commands are:SU: Switching usersWho: Check all current accountsWHOAMI: Check your accountWhereis: Find the specified file, command locationWhatis: Function of query commandWhich: Displ