Terminal Commands

Basic Computer Operation

Linux user operation

Show all local user of your machine

cut -d: -f1 /etc/passwd

Add new user

sudo adduser username
# or
sudo useradd username

Add new user without password

adduser --disabled-password --gecos "" username

User password change

sudo passwd username

Grant root access to an user

sudo usermod -aG sudo username

Log in to other user

su username

Log out

exit

File permission

4 => stands for "read",

2 => stands for "write",

1 => stands for "execute", and

0 => stands for "no permission."

Read only permission

chmod 4 filename

All permission (4+2+1=7)

chmod 7 filename

change ownership for directory and file to other user

sudo chown -R  hnj directory
sudo chown -R  hnj file.txt

Create a directory

mkdir DirectoryName

Rename directory

mv oldname newname

Move to the directory

cd DirectoryName

Move to hierarchical directory

cd DirectoryName/insideDirectoryName

Remove empty directory

rm -d DirectoryName

Remode non-empty directory

rm -r DirectoryName

Create new file

touch filename.txt 	# using touch

gedit filename.txt	# using gedit

cat > filename.txt	# using cat

Rename file

mv old.txt new.txt

Remove file

rm filename.txt

Remove multiple file

rm file1.txt file2.txt

File open with gedit editor

gedit file.txt

File open with nano terminal editor

nano file.txt

Check terminal command history

history

Save history in a text file

history > filename.txt

Application running command

Open firefox

firefox

Maven Spring boot project

mvn spring-boot:run

Create JAR of Maven Spring boot project

mvn package

Run JAR

java -jar filename.jar

Angular project

ng s --open

React project

yarn start

Rails project

rails s

Linux terminal shortkeys

Open terminal

ctrl + alt + t

Linux terminal new tab

Ctrl + shift + t

Switch between different tabs

alt + number # number=1,2,3...

Zoom in terminal fonts

ctrl + shift + (+)

Zoom out terminal fonts

ctrl + (-)

Linux shortkeys

Bookmark folder

ctrl + d

Intellij IDE shortkeys

Run a java main program

ctrl + shift + f10

New class within project directory

alt + insert

New class within current package

ctrl + alt + insert

Find and jump to the desired class, file

ctrl + shift + n

Text search in all files

ctrl + shift + f

Switch between intellij editor view to terminal

alt + f12

New tab in intellij terminal

Ctrl + shift + t