Windows Command Prompt

@echo off
REM This is a comment
echo Hello World
pause

REM Variables
set name=John
echo Hello %name%

REM Conditional statements
if exist file.txt (
    echo File exists
) else (
    echo File does not exist
)

REM Loops
for %%i in (1 2 3 4 5) do (
    echo Number: %%i
)

REM Functions
:myfunction
echo This is a function
goto :eof

call :myfunction

# PowerShell script example
param(
    [string]$Name = "World"
)

# Variables
$message = "Hello $Name"
Write-Host $message

# Functions
function Get-Greeting {
    param([string]$Name)
    return "Hello, $Name!"
}

# Conditional statements
if (Test-Path "file.txt") {
    Write-Host "File exists"
} else {
    Write-Host "File does not exist"
}

# Loops
for ($i = 1; $i -le 5; $i++) {
    Write-Host "Number: $i"
}

# Arrays
$fruits = @("Apple", "Banana", "Orange")
foreach ($fruit in $fruits) {
    Write-Host "Fruit: $fruit"
}

# Error handling
try {
    Get-Content "nonexistent.txt"
} catch {
    Write-Host "Error: $($_.Exception.Message)"
}

# Check disk space
Get-WmiObject -Class Win32_LogicalDisk | Select-Object DeviceID, @{Name="Size(GB)";Expression={[math]::Round($_.Size/1GB,2)}}, @{Name="FreeSpace(GB)";Expression={[math]::Round($_.FreeSpace/1GB,2)}}

# List installed programs
Get-WmiObject -Class Win32_Product | Select-Object Name, Version

# Check Windows updates
Get-HotFix | Sort-Object -Property InstalledOn -Descending | Select-Object -First 10

# Monitor system performance
Get-Counter "Processor(_Total)% Processor Time", "MemoryAvailable MBytes" -SampleInterval 5 -MaxSamples 10

# Check event logs
Get-EventLog -LogName Application -Newest 10 | Select-Object TimeGenerated, Source, Message

# Network diagnostics
Test-NetConnection -ComputerName google.com -Port 80
Test-NetConnection -ComputerName 8.8.8.8 -Port 53

# Find files by extension
Get-ChildItem -Path C:\ -Recurse -Include "*.txt" -ErrorAction SilentlyContinue

# Backup files
$source = "C:\Important"
$destination = "D:\Backup\$(Get-Date -Format 'yyyy-MM-dd')"
Copy-Item -Path $source -Destination $destination -Recurse

# Clean up old files
$cutoffDate = (Get-Date).AddDays(-30)
Get-ChildItem -Path "C:\Temp" -Recurse | Where-Object {$_.LastWriteTime -lt $cutoffDate} | Remove-Item -Force

# Monitor file changes
$watcher = New-Object System.IO.FileSystemWatcher
$watcher.Path = "C:\Monitor"
$watcher.Filter = "*.txt"
$watcher.EnableRaisingEvents = $true

Register-ObjectEvent $watcher "Changed" -Action {
    Write-Host "File changed: $($Event.SourceEventArgs.FullPath)"
}

# Check network connectivity
ping google.com
Test-NetConnection google.com

# Check DNS resolution
nslookup google.com
Resolve-DnsName google.com

# Check network route
tracert google.com
Test-NetConnection google.com -TraceRoute

# Check open ports
netstat -an | findstr :80
Get-NetTCPConnection -LocalPort 80

# Check network adapter status
ipconfig /all
Get-NetAdapter | Where-Object {$_.Status -eq "Up"}

# Reset network configuration
ipconfig /release
ipconfig /renew
ipconfig /flushdns

# Check firewall status
netsh advfirewall show allprofiles
Get-NetFirewallProfile