Familiar 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

Cd/usr

Ls

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

(6) Create directory A1/a2/a3/a4

Mkdir-p A1/A2/A3/A4

CD A1/A2/A3/A4

RmDir Command: Delete empty directory

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

RmDir A

Ls

(8) Delete directory a1/a2/a3/a4to see how many directories exist

Rmdir-p A1/A2/A3/A4

Ls

CP Command: Copy files or directories

(9) copy the. BASHRC under the home folder to/ usr , named bashrc1

Cp/home/kyro/.bashrc/usr/bashrc1

Cd/tmp

Ls-a

Create a new directory Test in/tmp and copy the contents of this directory to/ usr

Cd/tmp

mkdir test

sudo cp –r/tmp/test/usr

MV command: Move files and directories, or rename

(one) Move the example file Bashrc1 to the directory /usr/test

sudo mv/usr/bashrc1/usr/test

Rename the above example test directory to test2

sudo mv/usr/test/usr/test2

RM command: Removing files or directories

Delete the Bashrc1 file copied from the previous example

sudo rm/usr/test 2/bashrc1

Remove the Test2 directory from the example above

sudo rm-r/usr/test 2

Cat Command: View file contents

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

Cat ~/.BASHRC

TAC Command: Reverse list

(+) Reverse View the contents of the. BASHRC file in the home folder

Cat ~/.BASHRC

More command: One page, one page turn to view

Page turn toview the contents of the . BASHRC file in the home folder

More~/.bashrc

Head Command: Remove the previous lines

View the contents of the. bashrc file in the home folder first line

Head –N-~/.BASHRC

View the contents of the. bashrc file under the home folder , which is not displayed in the following line, showing only the previous lines

Head –n-50 ~/.BASHRC

Tail command: Take back a few lines

View the contents of the. bashrc file in the home folder last line

Tail –N-~/.BASHRC

View the contents of the . bashrc file in the home folder , listing only the data after

Tail –n +50 ~/.bashrc

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

Create an empty file in/tmp Hello and check the time

Cd/tmp

Touch Hello

LS –l Hello

Modify the Hello file to adjust the date to 5 days ago

Touch –D "5 days ago" Hello

Chown Command: Modify file Owner Permissions

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

sudo chown Root/tmp/hello

LS –l/tmp/hello

Find command: File lookup

Find the file named. BASHRC in the home folder

Find ~-NAME.BASHRC

Tar command: Compress command

Create a new folder in/directory test and then package it in / directory into test.tar.gz

sudo mkdir/test

sudo tar –zcv –f/test.tar.gz test

Unzip to/tmp directory

sudo tar –zcv –f/test.tar.gz-c/tmp

grep command: Find string

Find the string ' examples ' from the ~/.BASHRC file

grep –n 'examples' ~/.bashrc

Configure the Java environment variable, set in ~/.bashrc

Gedit ~/.BASHRC

() view The value of the Java_home variable

Echo $JAVA _home

Familiar Linux operations