What Is Shell? Types of Shell and Windows PowerShell Command Master List (2026)

What is Shell? Types of Shell and Complete Windows PowerShell Command Master List (2026 Guide)

When I first started working in cybersecurity, I quickly realized something important — real control over a system does not come from clicking icons. It comes from understanding the command line. That’s where the concept of a Shell becomes powerful.

A shell is a computer program that presents a command-line interface (CLI), allowing users to control the operating system using text-based commands instead of a graphical user interface (GUI). Instead of relying on mouse clicks, the user types commands using specific keywords to perform actions.

In cybersecurity, system administration, automation, and ethical hacking, mastering the shell is not optional — it is essential.

Table of Contents

• What is Shell?
• Types of Shell
• What is PowerShell?
• Basic Windows PowerShell Commands
• System Information Commands
• File & Directory Management
• Network & Connectivity
• User & Security Management
• System Maintenance
• Windows & Application Management
• Shutdown & Restart
• Additional Advanced PowerShell Commands
• Frequently Asked Questions

What is Shell?

A Shell is a computer program that presents a command line interface (CLI) which allows you to control your computer using commands entered with a keyword instead of controlling a graphical user interface (GUI) with a mouse and keyboard combination.

In simple words, a shell acts as a bridge between the user and the operating system. Instead of clicking buttons, you type instructions. These instructions are interpreted and executed by the operating system.

For cybersecurity professionals, developers, and system administrators, the shell is not optional. It is essential. Automation, scripting, penetration testing, system hardening, and incident response heavily depend on shell access.

Types of Shell

1. Windows PowerShell (2006 – Windows 7 to Windows 11)

Windows PowerShell was introduced in 2006 by Microsoft. It works across modern Windows systems including Windows 7, Windows 8, Windows 10, and Windows 11. It is more powerful than traditional Command Prompt (CMD).

2. Bash Shell (1989)

Bash (Bourne Again Shell) was written in 1989 by Brian Fox and developed under the GNU Project. It is the default shell for most Unix and Linux operating systems.

If you want to understand Linux deeply, mastering Bash is mandatory. If you want to master Windows automation, PowerShell is your best weapon.

What is PowerShell?

PowerShell is a task automation and configuration management framework from Microsoft. It consists of a command-line shell and an associated scripting language.

Unlike traditional command-line tools that return text output, PowerShell works with objects. This makes automation extremely powerful and structured.

In cybersecurity operations, PowerShell is widely used for:

• Incident response
• Log analysis
• Active Directory enumeration
• System auditing
• Automation scripting

Basic Windows PowerShell Commands

List All Commands

Get-Command

Lists all available PowerShell commands, functions, aliases, and scripts.

Help Command

Get-Help Get-Process

Displays help information about a specific command.

Clear Screen

Clear-Host

Clears the PowerShell screen.

Start a Program

Start-Process notepad

Opens a program like Notepad.

Install Software Using Winget

winget install googlechrome

Search and install software using Windows Package Manager.

System Information

Show PowerShell Host Details

$Host

Display System Information

Get-ComputerInfo

List Running Processes

Get-Process

Stop a Process

Stop-Process -Name notepad

List Services

Get-Service

Restart a Service

Restart-Service spooler

File & Directory Management

Show Current Location

Get-Location

Change Directory

Set-Location C:\Users

List Files and Folders

Get-ChildItem

Create a New File

New-Item -Path "C:\Users\think\onedrive\Desktop\xyz.txt" -ItemType File

Delete File

Remove-Item xyz.txt

Copy File

Copy-Item source.txt -Destination D:\Backup

Move File

Move-Item source.txt -Destination D:\Documents

Read File Content

Get-Content xyz.txt

Write Content to File

Set-Content xyz.txt "Hello World"

Network & Connectivity

Check Network Connection

Test-NetConnection example.com

Display IP Address

Get-NetIPAddress

List Network Adapters

Get-NetAdapter

Show DNS Client Info

Get-DnsClient

DNS Lookup

Resolve-DnsName example.com

Ping Command

Test-Connection example.com

User & Security Management

List Local Users

Get-LocalUser

Create New User

New-LocalUser -Name username

Delete User

Remove-LocalUser -Name username

Change User Password

Set-LocalUser -Name username -Password (ConvertTo-SecureString "NewPassword" -AsPlainText -Force)

Check Security Logs

Get-EventLog -LogName Security

System Maintenance

List Disks

Get-Disk

Show Partitions

Get-Partition

Optimize Drive

Optimize-Volume -DriveLetter C

Application Logs

Get-EventLog -LogName Application

Windows & Application Management

List Installed Apps

Get-AppxPackage

Uninstall App

Remove-AppxPackage AppName

List Windows Features

Get-WindowsOptionalFeature -Online

Enable Windows Feature

Enable-WindowsOptionalFeature -FeatureName TelnetClient

Disable Windows Feature

Disable-WindowsOptionalFeature -FeatureName TelnetClient

Shutdown & Restart

Restart Computer

Restart-Computer

Shutdown Computer

Stop-Computer

Exit PowerShell Session

Exit-PSSession

Additional Advanced PowerShell Commands You Should Know

Export Data to CSV

Get-Process | Export-Csv processes.csv

Import CSV

Import-Csv processes.csv

Check Execution Policy

Get-ExecutionPolicy

Set Execution Policy

Set-ExecutionPolicy RemoteSigned

Get Running Services Only

Get-Service | Where-Object {$_.Status -eq "Running"}

Get Installed Hotfixes

Get-HotFix

View Environment Variables

Get-ChildItem Env:

Create Folder

New-Item -Path "C:\NewFolder" -ItemType Directory

Measure Object

Get-Process | Measure-Object

Why PowerShell Is Critical for Cybersecurity Professionals?

In incident response, penetration testing, system hardening, and digital forensics, PowerShell is heavily used. Attackers also misuse PowerShell for fileless malware techniques, which makes it even more important for defenders to understand it deeply.

If you want to master command-line environments, you should also explore our detailed guide on Windows CMD Master Commands.

• Windows CMD Command Master List (2026): 200+ Commands Explained for Admins & Cybersecurity Experts
  
• Port Forwarding Explained: Uses, Security Risks & Best Tunneling Services (2026)
  
• 100+ Cybersecurity Roles Explained: The Complete 2026 Career Roadmap
  
• Government & PSU Cybersecurity Jobs in India: Official Career Links Guide (2026)
  
• The Ultimate Guide to Windows CMD Commands for Network Troubleshooting & Security
  
• What is Network Topology? Physical & Logical Types Explained with Bus, Star, Mesh & More
  
• What is a Router? Types, Functions & Security Explained Clearly
  
• What is a Computer Network? NIC, Hub, Switch (L1, L2, L3) Explained Clearly
  
• P2P vs Client-Server Model: The Core Difference Every IT Student Must Know
  
• What is Internetworking? How the Entire Internet Connects and Works
  
• What is Networking? LAN, WAN, Devices, Security & Technologies Explained
  
• What is Network in Cyber Security? The Foundation Every IT Student Must Know
  
• What is IANA? The Hidden Authority Controlling the Internet’s 65,536 Ports
  
• AnyDesk Protocol Explained: Ports 7070 & 6568, Encryption Model, and Security Risks
• TeamViewer Protocol Explained: Ports, Encryption, Uses & Security Risks
• IRC Protocol Explained: Why It Still Matters in Cyber Security
• X11 Protocol Explained: How Remote Linux GUIs Work and Why It Matters
  
• VNC Server Protocol Explained: Uses, Ports, Risks, and Security Best Practices

Frequently Asked Questions

Is PowerShell better than CMD?

Yes. PowerShell is object-oriented and far more powerful than traditional CMD.

Is PowerShell used in cybersecurity?

Absolutely. It is widely used for system auditing, log analysis, automation, and Active Directory management.

Should beginners learn PowerShell?

If you are serious about Windows administration or cybersecurity, learning PowerShell is highly recommended.

Final Words

Mastering the shell is not just about typing commands. It is about understanding how systems work internally. Whether you choose Bash or PowerShell, both are powerful tools in the hands of a cybersecurity expert.

If you truly want to stand out in 2026 as a system administrator, ethical hacker, or SOC analyst, PowerShell mastery is no longer optional. It is a necessity.