ccna basic commands

redirectionStandard input: Code 0, using Standard output: Code 1, using > or >>Standard error Output: Code 2, using 2> or 2>>1>: Output the correct data to the specified file or device in an overriding way1>>: Output the correct data to the specified file or device in an additive way2>: outputting the wrong data to the specified file or device in an overridden manner2>>: The incorrect data is output to the specified file or device in an additive way4. The judgment basis of the command execution

I. Linux basic management commands and Linux management commands 1. Shutdown and restart command (1) shutdown command: shutdown [Option] Time Option:-c. Cancel the previous shutdown command. -H Shutdown -R restart Example: shutdown-h now # shut down immediately, root User + 10 # shutdown in 10 minutes # Define the absolute restart time (2) Other shutdown

Linux entry (1)-Basic commands and linux entry commands This series of Linux beginners are the basic content I have summarized on the basis of "laruence's Linux private house dish", mainly to record my learning process, but also to facilitate your brief understanding. Linux Distribution is Ubuntu rather than CentOS rec

MySQL database basic commands (favorites), mysql commands I sorted out the basic mysql commands and shared them. # Start, stop, and restart MySql service mysql start | stop | restart/etc/init. d/mysql restart | start | restart # connect to MySQL database mysql-h127.0.0.1-u

1. Format description"[email protected] Simon" $"[Email protected] ~" $Both of these methods represent the same. Simon is the specified user, localhost is the computer name, if not set to localhost by default. Simon, ~ refers to the directory where you are currently located.Terminal: Command interpreter, simulation shell2, the user's switchsu[options] [user]such as: Su-rootThe example uses the SU command to change a normal user to the root user and use the option "-" to carry the root environmen

Basic Linux commands and Linux commands Compression and decompression commands Compression: tar-zcvf appName.tar.gz. date appFileName (for example, tar-zcvf rc.tar.gz. 0513 rc) Decompress: tar-xvf tarFile Tar command details: Tar package compression;-c archive file,-x compressed file,-z gzip co

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

Linux basic commands (2) commands on disk space, linux disk spaceDisk Space commands Command Function Mount Mount a File System Umount Detach a mounted file system Df Check the disk space of each hard disk partition and mounted file system Du Show file directo

Improve readability of information in kilobytes, MB, GB -S Only the sum of each file size is listed -X Only compute files that belong to the same file system 2.5 fsck CommandThe function of the fsck command is to check and repair the Linux file system, which is best used when no one or no partition hangs up, in fact, each boot system will do a check to see if there is a bad track or data loss phenomenon. Usage:fsck (-option) partition name

, which is a very dangerous option -V Verbose: Show the progress of a file's movement MV T.txt document moves the file T.txt to the directory document.1.9 RM CommandThe RM command is used to delete files. Options Description -I. Interactive: Prompt to confirm deletion -F Force: Replace interactive mode without prompting to confirm deletion -V Verbose: Show file deletion progress

Summary of basic MySQL commands and common commands bitsCN.com Start: net start mysql;Enter: mysql-u root-p/mysql-h localhost-u root-p databaseName;List databases: show databases;Select database: use databaseName;List tables: show tables;Show columns from tableName;Create a database: source fileName.txt;Matching character: Wildcard _ can be used to represent any

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Five steps to master the basic development and usage commands of Git, and five steps to master git commandsStep 1: set global variables: git config --global user.name "gang.li"git config --global user.email "ligang@ptthink.com"Step 2: Initialize the repository and push it to the remote repository (if this step is performed for the first push, otherwise skip this step ): /* Create a project folder and initia

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

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 ();