Linux basic Commands Encyclopedia

PWD: Show current path
CD: Switch directories
Usage: CD
Cd.. /Switch to Parent directory
CD/Switch to root directory
CD ~ (or CD only) switch to the current user home directory (the folder under the username named under Home)/root directory

mkdir Creating a Directory
mkdir directory name-p recursively Create directory

RmDir Delete Empty Directory
Usage: RmDir directory name
Also available: RM-RF directory name

LS View directory or file information
Main options:
-L lists the details of the directory or file. such as permissions, modification time, etc.
-a lists all files in the current directory, including hidden files (hidden files at the beginning of the point)

vi text editor
Type I enter edit state
exit Edit Press ESC

save exit:  : Wq
Enter/, go to search
input: Set NU, Displays the number of rows for each row
press keyboard g to navigate directly to the end

CP Replication
Usage: CP [options] file name or directory destination address
-r copy directory and all directories and files under directory
CP a.txt b.txt Copy a file with a name B file (directory name)

MV Move
Usage: MV file name or directory destination directory
MV A.txt. /move a file to the parent directory (move one file to another directory without renaming)
MV A.txt. /b.txt move a file to the previous level and change the name to B file (move one file to another directory and rename)

RM Delete a file or directory
-F Force Delete
-R Delete Directory
Frequently used: RM-RF files or directories

Find File
Usage: Find [path] [options]
Common options are:
Find. -name *.log find files ending with. Log in the current directory
Find/-name log in the root directory for log-named directories

grep filtering
Finds the character (string) in the specified file and prints the line
Usage: grep string file name
grep band file looking for band string in file

Cat display text file contents
Usage: Cat filename cat file name

Head View first few lines
Usage: head-n 5 file name

Tail writes files to standard output starting from a specified point
Tail-n 5 file name view after a few lines
Tail-f Error.log constantly refreshed, see the latest content

PS viewing process (dynamic)
-EF displays all running processes and displays commands to start the process

Netstat viewing network status (net status shorthand)
NETSTAT-APN View All ports
An, sort the output in a certain order
P, which indicates which process is calling the

| pipe character (vertical bar, The English IME state shift+ on the keyboard |\ )
Create a pipeline between commands, Use the output from the preceding command as input to the following command

echo print file contents or edit file contents
Common options are:
-n does not wrap output
-e You can use the escape character (\ n carriage return, \ t tab)
example:
echo" I am studying Linux ">>xujun.txt append file trailer content
echo $?  if the return value is 0, indicates the last command was successful. If it is 1 to 255, it is a failure
echo-e "Wo\tshi\tshei" > Xujun.txt

Touch creates a blank file, and if the current directory has the same file, the timestamp of the file is updated
-A Modify access (access) time
-M Modify Modify (Modify) time these two parameters to understand

Uname viewing system
-M view system is a few operating systems
-R View kernel version of the system
-A view detailed system kernel version and system operating system

RZ upload
If this command is not available in the system, install it using yum install Lrzsz
-Y Overlay
Directly input RZ, you can upload files

SZ Download
If this command is not available in the system, install it using yum install Lrzsz
-Y Overlay
Sz-y Test.txt

SU Switch User
Su Root

History View Command Chronicle

chmod permissions given to commands
-R recursively Change permissions for all subdirectories and files under the directory
Digital way: r=4 w=2 x=1

chmod 777 Lemon

Directly input RZ, you can upload files

Linux basic Commands Encyclopedia