Powershell Foreach where-object -eq 值

Question

如果我导入计算机名称 $computers 的 csv，如下所示

Host
----
computer5
Computer20
Computer1

并导入另一个 csv 数据 $data，如下所示

Host        OS         HD    Capacity Owner
----        --         --    ------   -----
Computer20  Windows7   C      80      Becky
Computer1   Windows10  C      80      Tom
Computer1   Windows10  D      100     Tom
computer5   Windows8   C      100     sara
computer5   Windows8   D      1000    sara
computer5   Windows8   E      1000    sara

我正在尝试这样做

foreach ($pc in $computers){
                          $hostname = $pc.host
                          foreach ($entry in $data | where {$enty.host -eq $hostname})
                              {write-host "$entry.Owner"}
                          }

foreach 语句未找到任何匹配项。我怎样才能解决这个问题？我想做的不仅仅是写所有者的名字，但是，这是基本前提

谢谢！史蒂夫

Answer 1

在 Where-Object 过滤器块内用 $_ 替换 $enty：

foreach ($entry in $data |Where-Object {$_.host -eq $hostname}){
  Write-Host $entry.Owner
}

Answer 2

这是另一种方法，使用 -eq 运算符左侧的数组 $computers.host：

$computers = 'Host
computer5
Computer20
Computer1' | convertfrom-csv

$data = 'Host,OS,HD,Capacity,Owner
Computer20,Windows7,C,80,Becky
Computer1,Windows10,C,80,Tom
Computer1,Windows10,D,100,Tom
computer5,Windows8,C,100,sara
computer5,Windows8,D,1000,sara
computer5,Windows8,E,1000,sara' | convertfrom-csv

$data | where { $computers.host -eq $_.host } | ft

Host       OS        HD Capacity Owner
----       --        -- -------- -----
Computer20 Windows7  C  80       Becky
Computer1  Windows10 C  80       Tom
Computer1  Windows10 D  100      Tom
computer5  Windows8  C  100      sara
computer5  Windows8  D  1000     sara
computer5  Windows8  E  1000     sara

或

$data | where host -in $computers.host

或

foreach ( $entry in $data | where host -in $computers.host | foreach owner ) { 
  $entry }

Becky
Tom
Tom
sara
sara
sara

假设 $entry 拼写正确，这个语法恰好不起作用。

表达式 $data | where {$entry.host -eq $hostname} 本身没有意义。不过是个好问题。您确实可以在 foreach 之后的括号中使用管道。

foreach ($pc in $computers){
  $hostname = $pc.host
  foreach ($entry in $data | where {write-host "entry is $entry";
           $entry.host -eq $hostname}){
    write-host "$entry.Owner"
  }
}

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Powershell Foreach where-object -eq 值

Powershell Foreach where-object -eq value

powershell

foreach