# Linux Basics: Essential Linux Commands

Linux is a powerful operating system that provides a command-line interface (CLI) to interact with the system efficiently. In this blog, we will explore some fundamental Linux commands that every beginner should know.

## 1\. man (manual)

***man*** command is used to display the user manual of any command that we can run on the terminal.

**Syntax:**

> man <command>

**Example:**

> man ls
> 
> #Displays the manual for the 'ls' command

## 2\. clear (clear the terminal)

***clear*** command is used to clear the terminal (or) used to remove all the text in the terminal.

**Syntax:**

> clear

## 3\. pwd (print working directory)

***pwd*** command is used to print the present directory you are working in.

**Syntax:**

> pwd

**Example output:**

> /home/user

## 4 . ls

***ls*** command is used to list the files and directories in the current directory.

**Syntax:**

> ls \[options\]

common options:

ls -a → to show the hidden files

ls -l → long listing format of the files

**Example:**

> ls -l

## 5\. echo

***echo*** command is used to print the text on the terminal.

**Syntax:**

> echo \[message\]

**Example:**

> echo “hello world!”

**Output:**

> hello world!

## 6\. whoami

***whoami*** command displays the username of the currently logged-in user.

**Syntax:**

> whoami

**Example Output:**

> charan

## 7\. date

***date*** command displays the current system time and date.

**Syntax:**

> date

**Example Output:**

> Thu Feb 14 10:30:00 IST 2025

## 8\. bc (Basic Calculator)

***bc*** command allows you to perform mathematical calculations.

**Syntax:**

> bc

**Example:**

> echo “10 + 5” | bc

**Output:**

> 15

**Note:**

> NOTE: Pipe symbol ( | ) is used to pass the output of the first command as the input of the next command.
> 
> In the above example first command **echo “10 + 5”** output is 10 + 5 , this is passed as a input to the second command **bc**

## 9\. cal

***cal*** command used to display the calendar of the current month.

**Syntax:**

> cal

**Example Output:**

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1739549165070/f0ab9239-3485-4f13-b2ff-a0cce8e0f38a.jpeg align="left")

You can also get the calendar of any month.

**Example:**

> cal jan 2020

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1739549430961/8039808e-12eb-486c-b526-93e5aefa585a.png align="left")

## 10\. help

***help*** command provides information about built-in shell commands.

**Syntax:**

> help \[command\]

**Example:**

> help ls

## 11\. history

***history*** command displays previously executed commands.

**Syntax:**

> history

**Example Output:**

> ls
> 
> pwd
> 
> echo “10 + 5” | bc
> 
> cal

## 12\. alias

***alias*** command allows you to create custom shortcuts for commands.

**Syntax:**

> alias <shortcut> = “\[command\]”

**Example:**

> alias ll=”ls -la”

Now typing **ll** will execute **ls -la** .

## 13\. sudo

***sudo*** command allow a user to run commands with administrative privileges.

**Syntax:**

> sudo \[command\]

**Example:**

> sudo apt update

## 14\. su

***su*** command allows switching to another user account.

**Syntax:**

> su <username>

**Example:**

> su root

## 15\. exit

***exit*** command is used to log out or close the terminal session.

**Syntax:**

> exit

## Conclusion

These are some of the essential Linux commands that every beginner should learn. Stay tuned for the next blog in this series!

Read the blog **Introduction to linux part-1** — [https://hashnode.com/post/cm74a32b3000009jjgb4c3ute](https://hashnode.com/post/cm74a32b3000009jjgb4c3ute)