Familiar with common Linux operations

Please follow the Linux basic commands as required on the machine.

CD command: Switch directories

(1) Switch to directory/usr/local
Cd/usr/local

(2) Go to the current upper directory
Cd..

(3) Go back to your home folder
CD ~

ls command: View files and directories

(4) View directory/usr for all files
ls-l/user

mkdir command: Create new directory

(5) Enter the/tmp directory, create a directory named A, and see how many directories exist
Cd/tmp
mkdir A
Ls-l

(6) Create directory A1/A2/A3/A4
Mkdir-p A1/A2/A3/A4

rmdir command: Delete empty directory

(7) Delete the directory A (/tmp) created in the example above
RmDir A

(8) Delete directory a1/a2/a3/a4 to see how many directories exist
RmDir a1/a2/a3/a4
Ls-l

CP command: Copy files or directories

(9) Copy the. BASHRC under the home folder to/usr, named Bashrc1
sudo cp. BASHRC/USR/BASHRC1

(10) Create a new directory test in/tmp and copy the contents of this directory to/usr

sudo cp-r/tmp/test/usr

MV Command: Move files and directories, or rename

(11) Move the example file Bashrc1 to the directory/usr/test
sudo mv/usr/bashrc1/usr/test

(12) Rename the above example test directory to Test2

sudo mv/usr/test/usr/test2

RM command: Removing files or directories

(13) Delete the Bashrc1 file copied from the previous example
sudo rm/usr/test2/bashrc1

(14) Delete the Test2 directory of the above example
sudo rm-r/usr/test2

Cat command: View file contents

(15) View the contents of the. bashrc file under the home folder
Cat. BASHRC

TAC Command: Reverse list

(16) Reverse View the contents of the. bashrc file in the home folder
Tac. BASHRC

More command: One page, one page turn to view

(17) Turn the page to view the contents of the. bashrc file in the home folder

More. BASHRC

Head command: Remove the previous lines

(18) View the first 20 lines of the contents of the. bashrc file in the home folder
Head-n. BASHRC

(19) View the contents of the. bashrc file in the home folder, followed by 50 lines, showing only the previous lines
Head-n -50. BASHRC

Tail command: Take back a few lines

(20) View the contents of the. bashrc file in the home folder the last 20 lines
Tail-n. BASHRC

(21) View the contents of the. bashrc file in the home folder, listing only 50 rows of data
Tail-n +50. BASHRC

Touch command: Modify the file time or create a new file

(22) Create an empty file in/tmp Hello and check the time
Mkdir/tmp/hello
Ls–al Tmp/hello

(23) Modify the Hello file to adjust the date to 5 days ago

Touch--help
touch-d "5 days Ago" Hello

Chown command: Modify file Owner permissions

(24) Change the owner of the hello file to the root account and view the properties

sudo chown root Hello

Find command: File lookup

(25) Find the file named. BASHRC in the home folder

Find ~/.BASHRC

Tar command: Compress command

(26) Create a new folder in/directory test and then package it in/directory into test.tar.gz
sudo mkdir test
SUDO–CZVF Tar test.tar.gz

(27) Unzip to/tmp directory
Tar test.tar.gz

grep command: Find string

(28) Find the string ' examples ' from the ~/.BASHRC file
Grep–n ' examples ' ~/.BASHRC

(29) Configure Java environment variables, set in ~/.BASHRC
Gedit ~/.BASHRC

(30) View the value of the Java_home variable
Echo $JAVA _home

Familiar with common Linux operations