Summary of basic Linux commands

Summary of common Basic Linux commands

At the beginning of learning Linux/unix, you may be confused by hundreds of commands, although there are many commands available, but the daily use of a few, if only a DBA role and not a system administrator, then come together to learn my summary of the Daily orders, summary of the relatively hasty, But there is still some, to learn together!

Command	Description	Example
Basic commands
Date	Show Time and date
Echo	Print out text on the screen
Grep	is a Find command	grep AA Test.txt
History	Give the commands you or other users have entered earlier	History-3 show the last three commands
Password	Change Password
Uname	Machine Name and machine information
Whereis	Ask where the executable file of the application is located	Whereis who
which	Help check if the version of the command is used correctly
W.H.O.	List all online users
WhoAmI	Who is the current user
Env	Show all environment variables
Mans	Help commands	Man Date
Directory Management
Cd	Switch directories
Ls	List Directory
Pwd	Show current directory
Mkdir	New Catalog
RmDir	Delete Directory
Important Linux Directories
/etc	directory where system configuration files are saved
/dev	Device information file
/tmp	Temporary files, logs, etc.
Home	When you create a user, you automatically assign the directory, and you have all the permissions for this directory
Root	All system administrators, at the top of the tree
Read the text
More	command display, press the screen, press ENTER to display the next screen	For larger text
Cat	Show all contents of current text	Small text
Head	The first 10 rows are displayed by default	Head-5/etc/group.txt
Tail	Display the following 10 rows by default	Tail-5/etc/group.txt
Managing Files
Diff	Compare Text	Diff T1.txt T2.txt
Touch	Create an empty file	Touch test.sh
Mv	Move the file, or change the file name	MV A.txt B.txt
Cp	Copy files	Cp A.txt/home
Rm	deleting files
chmod	Change file permissions	CHMOD–G–RW Test.txt
Chgrp	Change the group to which a file belongs	CHGRP groupname filename
Umask	Default file and directory permissions on the current server	It is an environment variable
Edit Text
Vi	Edit Document
Cursor navigation
H	Move one character to the left
L	Move one character to the right
J	Move down one line
K	Move up one line
W	To the beginning of the next word
B	To the beginning of a previous word
$	To the end of the current line
^	To the beginning of the current line
: G	To the end of the file
: l	to the file header
Gg	Move cursor to First line
G	Cursor moves to tail line
NG	Move cursor to nth row
Processing commands
I	Insert starting from current character
A	Start inserting from the next character
O	Insert from a new line below
O	Start inserting from a new line on top
X	Delete the character at the cursor location
Dd	Delete the downward line where the cursor is located
Ndd	Delete the next n rows where the cursor is located
R	Replace the character at which the cursor is located
(n) yy	Copy the (n) row where you are visiting
P	Pastes the copied rows after the current cursor
P (uppercase)	Paste the copied line on the current cursor
: Q	Exit and discard Changes
: wq!	Save and exit

Summary of basic Linux commands