Windows Powershell For 循环

$sum=0
for($i=1;$i -le 100;$i++)
{
    $sum+=$i
}
$sum

$sum=0
$i=1
for(;$i -le 100;)
{
    $sum+=$i
    $i++
}
$sum

for($domain="";!($domain -like "www.*.*");$domain=Read-Host "Input domain")
{
    Write-Host -ForegroundColor "Green" "Please give a valid domain name."
}
Please give a valid domain name.
Input domain: www
Please give a valid domain name.
Input domain: mossfly.com
Please give a valid domain name.

for($file=[IO.File]::OpenText("c:autoexec.bat") ; !($file.EndOfStream);$line=$file.ReadLine() )
{
    $line;
}
$file.Close()
REM Dummy file for NTVDM