ls
Lists all files and directories in the present working directory
ls -R
Lists files in sub-directories as well
ls -a
Lists hidden files as well
ls -al
Lists files and directories with detailed information like permissions,size, owner, etc.
cd or cd ~
Navigate to HOME directory
cd ..
Move one level up
cd /
Move to the root directory
cat > filename
Creates a new file
cat filename
Displays the file content
cat file1 file2 > file3
Joins two files (file1, file2) and stores the output in a new file (file3)
sudo
Allows regular users to run programs with the security privileges of the superuser or root
rm filename
Deletes a file
man
Gives help information on a command
history
Gives a list of all past commands typed in the current terminal session
clear
Clears the terminal
mkdir directoryname
Creates a new directory in the present working directory or a at the specified path
rmdir Deletes a directory
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