PowerShell腳本中的獲取服務

Question

一個基本問題 - 但爲什麼在PowerShell腳本中Get-Service不會將列表打印到輸出中？

Write-Host "Enumerating installed Services..." -ForegroundColor Green 
    Get-Service | Sort-Object status,displayname 

現在在腳本中根本沒有輸出。

但是，如果我打開了一個PowerShell提示，並手動鍵入它工作正常。

完整的腳本：

param([string] $server) 

$serverSystem = Get-WmiObject -computername $env:computername Win32_ComputerSystem 
$serverCPUDetail = Get-WmiObject -ComputerName $env:computername Win32_Processor 

switch ($ComputerSystem.DomainRole){ 
     0 {$ComputerRole = "Standalone Workstation"} 
     1 {$ComputerRole = "Member Workstation"} 
     2 {$ComputerRole = "Standalone Server"} 
     3 {$ComputerRole = "Member Server"} 
     4 {$ComputerRole = "Domain Controller"} 
     5 {$ComputerRole = "Domain Controller"} 
     default {$ComputerRole = "No role available" } 
    } 


$serverOS = Get-WmiObject -class Win32_OperatingSystem -ComputerName $env:computername 

Write-Host "Enumerating System information..." -ForegroundColor Green 
" " 
Start-Sleep -s 1 
Write-Host "Hostname:" ($env:computername) 
Write-Host "Domain:" ($serverSystem.Domain) 
Write-Host "Role:" ($ComputerRole) 
Write-Host "Operating System:" ($serverOS.Caption) 
Write-Host "Service Pack:" ($serverOS.CSDVersion) 
$lastBootTime = $serverOS.ConvertToDateTime($serverOS.Lastbootuptime) 
Write-Host "Last Boot Time:" $lastBootTime 
" " 
Write-Host "Enumerating Hardware information..." -ForegroundColor Green 
" " 
Start-Sleep -s 1 
Write-Host "Model:" ($serverSystem.Model) 
Write-Host "Manufacturer:" ($serverSystem.Manufacturer) 
Write-Host "CPU - No. of Processors:" ($serverSystem.NumberOfProcessors) 
Write-Host "CPU - No. of Cores:" ($serverCPUDetail.NumberofCores) 
Write-Host "CPU - No. of Processors, Logical:" ($serverCPUDetail.NumberOfLogicalProcessors) 
Write-Host "Memory in GB:" ([math]::round($serverSystem.TotalPhysicalMemory/1024/1024/1024,0)) 

" " 
Write-Host "Enumerating Disk Information..." -ForegroundColor Green 
Start-Sleep -s 1 
Foreach ($s in $env:computername) { 
    Get-WmiObject -Class win32_volume -cn $s | 
    Select-Object @{LABEL='Comptuer';EXPRESSION={$s}},DriveLetter, Label,@{LABEL='Free Space (GB)';EXPRESSION={"{0:N2}" -f ($_.freespace/1GB)}} 
} 
" " 
Write-Host "Enumerating Network Information..." -ForegroundColor Green 
" " 
Start-Sleep -s 1 
ForEach($NIC in $env:computername) { 
    $intIndex = 1 
    $NICInfo = Get-WmiObject -ComputerName $env:computername Win32_NetworkAdapterConfiguration | Where-Object {$_.IPAddress -ne $null} 
    $caption = $NICInfo.Description 
    $ipAddress = $NICInfo.IPAddress 
    $ipSubnet = $NICInfo.IpSubnet 
    $ipGateWay = $NICInfo.DefaultIPGateway 
    $macAddress = $NICInfo.MACAddress 
    Write-Host "Network Card": $intIndex 
    Write-Host "Interface Name: $caption" 
    Write-Host "IP Addresses: $ipAddress" 
    Write-Host "Subnet Mask: $ipSubnet" 
    Write-Host "Default Gateway: $ipGateway" 
    Write-Host "MAC: $macAddress" 
    $intIndex += 1 
} 
" " 
# Write-Host "Enumerating Software Installations..." -ForegroundColor Green 
# " " 
# Get-WmiObject -Class Win32_Product | Select-Object -property Name 

Write-Host "Enumerating installed Services..." -ForegroundColor Green 
Get-Service | Sort-Object status,displayname 

Answer 1

，你發佈的代碼是好的。這是別的，你沒有顯示，這是行不通的。

試試這個：

$script = @" 
Write-Host "Enumerating installed Services..." -ForegroundColor Green 
Get-Service | Sort-Object status,displayname 
"@ 

$script | Set-Content ./test.ps1 
./test.ps1 

上面寫一個腳本文件，你的兩行，然後執行腳本。正如你所期望的那樣，它會產生所需的輸出。

更新1

在看到輸入，現在我可以重現該問題。基本上如果你運行這個：

$a= Get-WmiObject -Class win32_volume -cn $s | 
    Select-Object @{LABEL='Comptuer';EXPRESSION={$s}},DriveLetter, Label,@{LABEL='Free Space (GB)';EXPRESSION={"{0:N2}" -f ($_.freespace/1GB)}} 
$b = Get-Service | Sort-Object status,displayname 
$a 
$b 

你會看到，它不工作。這裏發生的是默認Write-Output用於處理結果。寫 - 輸出在成功管道中寫入東西，而powershell則展開陣列。然後，我猜測輸出系統無法應對來自get-service和select-object的輸出具有不同類型的事實（並且由於解包它們最終位於同一陣列中）。

如果你改變你的腳本的最後一行

Get-Service | Sort-Object status,displayname | ft 

它會奏效。但是請注意，如果您要傳達腳本的結果，則最好在顯示之前將其格式化爲最後的格式（英尺）。基本上，一旦你將它傳輸到ft，除了輸出（顯示或文件）外，幾乎沒有什麼理由將它傳遞給其他任何地方。

更新2

This article解釋說，這PowerShell使用的第一個對象的數據流中，以確定如何格式化所有的人。這解釋了我們正在觀察的行爲。