PowerShell Cheat Sheet

$name = "John"

$age = 25

$fruits = @("apple", "banana", "cherry")

$person = @{ Name = "John"; Age = 30 }

$isActive = $true

$env:PATH

if ($x -gt 0) {
    Write-Host "positive"
} elseif ($x -lt 0) {
    Write-Host "negative"
} else {
    Write-Host "zero"
}

for ($i = 0; $i -lt 5; $i++) {
    Write-Host $i
}

foreach ($item in $array) {
    Write-Host $item
}

while ($count -lt 10) {
    $count++
}

switch ($day) {
    "Mon" { "Monday" }
    "Tue" { "Tuesday" }
    default { "Other" }
}

-eq   # Equal
-ne   # Not equal

-gt   # Greater than
-lt   # Less than
-ge   # Greater or equal
-le   # Less or equal

-like    # Wildcard match
-match   # Regex match
-contains  # Collection contains

-and  # AND
-or   # OR
-not  # NOT

function Greet {
    param([string]$Name)
    return "Hello, $Name!"
}

function Get-Data {
    [CmdletBinding()]
    param(
        [Parameter(Mandatory)]
        [string]$Path
    )
    Get-Content $Path
}

function Greet {
    param([string]$Name = "World")
    "Hello, $Name!"
}

Get-Process | Where-Object { $_.CPU -gt 10 }

Get-Process | Select-Object Name, CPU

Get-Process | Sort-Object CPU -Descending

1..5 | ForEach-Object { $_ * 2 }

Get-Process | Measure-Object -Property CPU -Sum

Get-Content "file.txt"

"Hello" | Out-File "file.txt"

"More text" | Add-Content "file.txt"

if (Test-Path "file.txt") { ... }

Copy-Item "src.txt" "dest.txt"
Move-Item "old.txt" "new.txt"

Remove-Item "file.txt"

try {
    Get-Content "missing.txt" -ErrorAction Stop
} catch {
    Write-Host $_.Exception.Message
}

try { ... } catch { ... } finally { Cleanup }

throw "Something went wrong"