basic coding commands

Summary of common linux commands and parameters (basic) and common linux commands 1. user's home directory (~) In linux, users all have their own home directories. you can place your own configuration files and other things. pwd: list the current directory. optional parameter-P: when the current directory is a link directory, the real path is displayed. ls: List

Linux basic commands and linux commandsLs command Pwd: display the current directory touch 11.txt: Create a txt file named 11 mkdir laowang under the current directory: Create a folder named laowang ls-a-l-h in the current directory: it is equivalent to ls-alh.-a is used to display all files in the current directory, including hidden files.-l is displayed as a list, -h is the size of the displayed file auto

(source) target (destination)[email protected] ~]# CP [options] Source1 source2 source3 .... directory Parameters used with the CP: -A: As-pdr means, please refer to the following instructions for PDR. (common)-D: If the source file is the attribute of the link file, the link file property is copied instead of the file itself;-I: If the target file (destination) already exists, the action will be asked (commonly used) when overwriting-P: Copy the past along with the properties of

Ipcclean removes internal and isolated signal sharing signs from the stopped PostgreSQL Server Pg_ctl start, stop, and restart the postgresql service (for example, pg_ctl start starts the postgresql service, which is the same as service PostgreSQL start) Pg_controldata displays the internal control information of the postgresql service Postgres PostgreSQL single-user database service Postmaster PostgreSQL multi-user database service 4. Psql is the most important client program. To e

Android Sqlite basic commands and androidsqlite commands To view the database, you must first find the db file. If you copy the file to a computer, you can view it in many ways. on your mobile phone, you can use commands to view it directly and conveniently. First, you need to find the database location. Generally, t

Basic Linux commands and Linux commands Cd-> transform path // file usually exists under/var/path, var can be modified storage disk Ls-> list all properties of hidden and Related Files # ls-al # Ls-al -Rwxrwxrwx 1 root 293 2016-02-23 test File property connection count file owner file user group size time file name -Rwxrwxrwx 1 root 293 2016-02-23 test Date-> cu

Basic PostgreSQL commands and PostgreSQL commands 1. Change the table name Alter table name rename to new table name 2. Change the field name Alter table name rename field name to new field name 3. Change the field type. For example, the original type of the ID field is character varying (50) and the new type is integer. Where, the ID contains numbers such as 1,

Common mysql commands and basic mysql commands Mysql database usage Summary This article mainly records some mysql commands for future query. 1. Change the root password Mysqladmin-uroot password 'yourpassword' 2. remotely log on to the mysql server Mysql-uroot-p-hip-P3306 3. query the database Show databases; 4. Enter

Common mysql commands and basic mysql commands I installed MySQL5.5.27 today to view some common commands. 1. log on to MySqlIn the cmd window, enter the bin directory installed by MySql,Command:Bin> mysql-u root-p[Database name] Press enter and enter the password 2. view the version number:Mysql> select version ();

(mm/dd/yy format) %T Display time format, 24-hour (HH:MM:SS) %x Format of the display date (MM/DD/YY) %y The last two digits of the year %Y Years (e.g. 2007, 2008) %r Time (Hh:mm:ss morning or afternoon) %p Show morning or afternoon If you enter a command:Date "+%x,%r"The system returns the following information:March 26, 2010, 18:06 P.M. 49 seconds4.7 cal CommandThe CAL co

file after a few lines-N: Specify the number of rows-F: Dynamically displays the end-of-file class capacityLN: Generating a linked file-S Create soft connectionExample: Ln-s source file Destination file generation soft connection (shortcut)ln source file destination file generated hard link (source file destination file sync update, copy, source file missing hard link still in, cannot cross partition)by Ls-i to see if it is a hard link, I-node numbers are the sameThis article is from the "Tommy

Summary of basic linux vi commands and summary of linuxvi commands This is to prevent you from forgetting and writing it, so it is not detailed. Yum install (command) Installation command Nano file editing Vi Delete file: rm -I confirm before deletion -F not confirmed before deletion -R recursive Deletion Rm-rf/file name Cp: copy Cp src dest -R -Confirm before I

Basic Linux commands and Linux commands [Epeter @ localhost ~] $ Where: epeter is the user name; localhost is the current host name ;~ The broken wave number indicates that the current user directory is used (If yes, the slash indicates that the current root directory is used ); $ indicates that you are currently logged on as a normal user (If yes, # indicates th

Linux Security Basics: network configuration commands and linux basic configuration commands 1. ifconfig view and configure network interface information(1) set an IP addressIfconfig eth0 192.168.0.1(2) temporarily disable or enable the NICIfconfig eth0 downIfconfig eth0 up(3) set the subnet maskIfconfig eth0 netmask 255.255.255.0(4) view the status of the first

Django basic commands, Django commands 1. Create a project Django-admin.py startproject myblog 2. Create an app Python manage. py startapp blog 3. Create a database table or change a database table or field Python manage. py makemigrations blog Python manage. py migrate 4. Run the Development Server Python manage. py runserver 5. Clear the database Pyt

chmod: Changing file or directory permissions-R Recursive modificationSyntax: chmod [{ugoa}{+-=}{rwx}] [file or directory]:u:user, G: Group, O: Other person, a: everyoneExample:chmod g+rw,o+rw yum.logchmod [mode = 421] [file or directory]650) this.width=650; "src="/e/u261/themes/default/images/spacer.gif "style=" Background:url ("/e/u261/lang/zh-cn/ Images/localimage.png ") no-repeat center;border:1px solid #ddd;" alt= "Spacer.gif"/>Chown: Change file or directory ownerExample: chown [user] [fil

[Shell] basic Shell functions: Historical commands aliases, and basic shell functions Bytes -------------------------------------------------------------------------------------------------------- I. History commands 　　History# View historical commands 　　History-c# Clear h

A few days ago learned the basic Linux commands, here to share, as a summary.Environment: 192.168.54.242Cd:CD-Switch to the first use path;Cd.. Go to Parent PathCD ~ Enter into the root/directoryCD Ibid.Cd.. /Relative DirectoryMkdir:mkdir a Create directory AMkdir-p a/b/c Creating a tree DirectoryMKDIR-M 777 A Create directory A and give maximum permissionsMkdir-m a=rwx a ibid.(About permissions: Rwx refers

Hello everyone, this time we will introduce some network configurations under liunx, simple basic optimization of shell, and level adjustment first. There are also some commands for you to take a look. Statement: I like to share with others. I am happy, that is, to make everyone happy. Some of my posts are my previous study notes, and some of my questions can be easily recorded, I also wrote it when I sudde

Basic Linux commands: sar and basic linux sarCommon sar command formats Sar [options] [-A] [-o file] t [n] Where: T indicates the sampling interval, and n indicates the number of samples. The default value is 1; -O file: stores the command results in binary format. file is the file name. Options is the command line option. Common options for sar