ループ

foreach

 $nums = @(1,2,3)
 foreach ($n in $nums) { write-host DEBUG: $n }
 
 DEBUG: 1
 DEBUG: 2
 DEBUG: 3

 foreach ($sv in Get-Service | select -First 3) { write-host DEBUG: $sv }

for

 for ($i = 0; $i -lt 3; $i++) {
     echo "DEBUG: $i"
 }

ショートハンド

 1..3 | % { echo "DEBUG: $_" }