Master the Linux Terminal: 8 Essential Commands and Prompt Basics

1. What Is a Shell?

The black window you see is a Terminal (terminal emulator) , and the program that runs inside it is the Shell . The shell receives your commands, translates them for the operating system kernel, and returns the results.

Bash (Bourne Again SHell) : the default shell on Ubuntu, widely used.

Zsh : a more feature‑rich shell popular among developers (installation covered in later tutorials).

2. Opening the Terminal

Shortcut: Ctrl + Alt + T (keep this shortcut handy).

Or search for "Terminal" in the Activities menu.

3. Understanding the Prompt

After opening the terminal you will see a line such as:

user@hostname:~$

user

: the current logged‑in username. hostname: the computer’s host name. ~: the current directory, representing the home directory /home/user. $: indicates a regular user; # would indicate the super‑user (root), which should be used with caution.

4. Core Navigation Commands

In the terminal you navigate with commands instead of a mouse. First, understand two path concepts:

Absolute path : starts from /, e.g., /home/user/Downloads.

Relative path : starts from the current directory, e.g., Downloads or ../Documents.

pwd (Print Working Directory)

Shows the full path of the current directory.

pwd
# Output: /home/user

ls (List)

Lists files and folders in the current directory.

ls
ls -l   # detailed info (permissions, size, time)
ls -a   # show hidden files (those starting with .)

cd (Change Directory)

Changes the current directory.

cd Downloads          # enter Downloads
cd ..                 # go up one level
cd ~                  # return to home directory
cd /                  # go to the root directory

mkdir (Make Directory)

Creates a new folder.

mkdir Projects

touch

Creates an empty file.

touch readme.txt

cp (Copy)

Copies files or directories.

cp file.txt file_backup.txt
cp -r folder1 folder2   # -r for recursive copy of a directory

mv (Move)

Moves or renames files.

mv file.txt Documents/   # move
mv oldname.txt newname.txt   # rename

rm (Remove)

Deletes files. Note that Linux terminal deletions bypass the recycle bin.

rm file.txt
rm -rf foldername   # force delete a folder and its contents (use with care)

5. Practical Tips

Tab completion : type part of a command or path (e.g., cd Do) and press Tab to auto‑complete (e.g., cd Downloads/).

Arrow keys : press up/down to scroll through command history, avoiding re‑typing.

Ctrl + C : abort a running program that is stuck.

Ctrl + L or clear: clear the screen.

Check help before executing : use command --help or man command (e.g., man ls).

Quote paths with spaces : wrap them in quotes, e.g., cd "My Files", otherwise the shell splits the path.

Practice these commands repeatedly; you’ll find typing on the keyboard far faster than navigating with a mouse.