if (条件)
{代码}
elseif (条件)
{代码}
else (条件)
{代码}
else
{代码}
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$n=10
if ($n -eq 1)
{"n=1"}
elseif ($n -ne 1)
{"n!=1,and n=$n"}
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$ComputerName = (Get-WmiObject -class win32_computersystem).name
$OS_Version = (Get-WmiObject -class win32_operatingsystem -computer $ComputerName).version

if (($OS_Version -eq "5.1.2600") -or ($OS_Version -eq "5.2.3790"))
{
    write-host "Computer Name:"$ComputerName

    if ($OS_Version -eq "5.1.2600")
    {
        write-host "OS:Windows XP"
    }
    elseif ($OS_Version -eq "5.2.3790")
    {
        write-host "OS:Windows 2003"
    }
}

elseif (($OS_Version -eq "5.0.2195") -or ($OS_Version -eq "6.1.7600"))
{
    write-host "Computer Name:"$ComputerName

    if ($OS_Version -eq "5.0.2195")
    {
        write-host "OS:Windows 2000 Server"
    }
    elseif ($OS_Version -eq "6.1.7600")
    {
        write-host "OS:Windows 7"
    }
}

else
{
    write-host "$ComputerName is not supported."
}

"–END OF REPORT–"
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switch (表达式)
{
  (表达式) {代码}
  值 {代码}
  default {默认执行代码}
}
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switch ((Get-WmiObject -Class win32_ComputerSystem).domainRole)
{
  0 {Write-Host "Standalone Workstation"}
  1 {Write-Host "Member Workstation"}
  2 {Write-Host "Standalone Server"}
  3 {Write-Host "Member Server"}
  4 {Write-Host "Backup Domain Controller"}
  5 {Write-Host "Primary Domain Controller"}
  default {Write-Host "Cannot determine domain role"}
}
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switch (100)
{
  (99 + 1) {Write-Host "99+1=100"}
  (1 + 100) {Write-Host "1+100=100"}
  (50*2) {Write-Host "50*2=100"}
  (33.333*3) {Write-Host "33.333*3=100"}
}
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