Get-Acl file.txt
Get-Acl C:\Windows | Format-List

Get-ChildItem                           # List current directory
Get-ChildItem -Recurse                  # Recursive listing
Get-ChildItem -Hidden                   # Show hidden files
Get-ChildItem -Force                    # Show all files including system

Get-CimInstance -ClassName Win32_Process
Get-CimInstance -ClassName Win32_Service

Get-Command                             # List all commands
Get-Command *service*                   # Find service-related commands
Get-Command -Verb Get                   # All commands that "get" things
Get-Command -Noun Process               # All process-related commands

Get-ComputerInfo | Select-Object WindowsProductName, TotalPhysicalMemory, CsProcessors

Get-Content file.txt
Get-Content file.txt -Tail 10          # Last 10 lines
Get-Content file.txt | Select-String "error"  # Search for text

Get-ExecutionPolicy                     # Current policy
Get-ExecutionPolicy -List               # All scopes

Get-Help Get-Process                    # Basic help
Get-Help Get-Process -Examples          # Show examples
Get-Help Get-Process -Detailed          # Detailed help
Get-Help Get-Process -Full              # Complete help
Get-Help *process*                      # Find commands with "process"

Get-NetTCPConnection -State Established # Active connections
Get-NetTCPConnection -LocalPort 80      # Connections on port 80

Get-Process                             # All processes
Get-Process -Name "chrome"              # Specific process
Get-Process | Where-Object {$_.CPU -gt 100}  # High CPU processes

Get-Service                             # All services
Get-Service -Name "win*"                # Services starting with "win"
Get-Service | Where-Object {$_.Status -eq "Running"}

Get-WmiObject -Class Win32_OperatingSystem
Get-WmiObject -Class Win32_LogicalDisk

$command = "Get-Process"
Invoke-Expression $command
# Or shorter: iex $command

Invoke-WebRequest -Uri "http://example.com"
# Shorter alias: iwr http://example.com

Resolve-DnsName google.com              # Resolve domain
Resolve-DnsName 8.8.8.8                 # Reverse DNS lookup

Set-Content -Path "file.txt" -Value "New content"
"Hello World" | Set-Content -Path "greeting.txt"

Set-ExecutionPolicy -Scope Process -ExecutionPolicy Bypass
Set-ExecutionPolicy RemoteSigned -Force

Stop-Process -Name "notepad" -WhatIf
Stop-Process -Id 1234 -Force

Test-NetConnection google.com           # Basic connectivity
Test-NetConnection google.com -Port 443 # Test specific port