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Loops & Conditionals

Iterate over collections and branch on conditions.

Looping

Run a block for each item coming down the pipeline.

1..5 | ForEach-Object { Write-Host "Number $_" }

Classic loop over an array.

$names = @("Ann", "Bob", "Cy")
foreach ($name in $names) {
    Write-Host "Hello $name"
}

Repeat while a condition holds.

$i = 0
while ($i -lt 3) {
    Write-Host $i
    $i++
}

Counter-based loop.

for ($i = 0; $i -lt 3; $i++) {
    Write-Host "Step $i"
}

Branch on comparison operators.

$n = 7
if ($n -gt 10) {
    "big"
} elseif ($n -gt 5) {
    "medium"
} else {
    "small"
}

Match a value against several cases.

switch ($env:OS) {
    "Windows_NT" { "Running on Windows" }
    default      { "Other OS" }
}

Keep only items matching a condition.

Get-Process | Where-Object { $_.CPU -gt 100 }