Powershell foreach如果错误

移动到下一个我有一个csv文件中的计算机列表，每个星期天早上9点做一次系统映像备份。Powershell foreach如果错误

hostname macaddr   comments 
TOTO-01  842B2BB728C1  Server Room 
KOKO-14  842B2BB7420F  Server Room 
FOFO-25  001AA0485902  Server Room

我试图创建一个PowerShell脚本，打开列表中的所有计算机，并做了一些检查，看看是否备份成功。

我遇到的问题是我希望脚本移动到列表中的下一台计算机，如果它没有通过任何一项检查。

我的代码如下：

param  
(
    [Io.FileInfo]$csvFile = 'C:\Scripts\VipBackUp.csv', 
    [Io.FileInfo]$WolCmdExe = 'C:\mgmt\tools\WolCmd.exe' 
) 

######Get the current date - 20 hours. 
$GetCurrentDate = (get-date) - (new-timespan -days 6) 
$GetCurrentDate 

#####Turn on PC 
function TurnOnPc 
{ 
    $TurnOn = invoke-expression "$WolCmdExe $macaddr 192.168.1.0 255.255.255.255" 
    write-host "" 
    write-host "Turning on $hostname.." 
    if($TurnOn) 
    { 
     write-host "$comp has been turned on" 
     write-host "" 
    } 
    else 
    { 
     $global:PCTurnOnError = "Yes" 
    } 
} 

#####Test PC connectivity 
function PingPC 
{ 
    Start-Sleep  3 
    $ping = test-connection -Computername $hostname -count 5 -quiet 
    write-host "Checking connection for $hostname" 
    if($ping) 
    { 
     write-host "Connection Found for $hostname" 
     write-host "" 
    } 
    else                           
    { 
     $global:PCPingError = "Yes" 
     Write-Host "$hostname unreachable" 
     write-host "" 
    }    
} 

#####Check backup files to see if they have been written to. 
function CheckWritePC 
{ 
    $global:OriginalWrite = Get-ChildItem "C:\Powershell Testing\$hostname.txt" 
    $global:OriginaSize = (Get-ChildItem "C:\Powershell Testing\$hostname.txt").length 
    write-host "" 
    write-host "Checking the following PC if it has been writen to: $hostname" 
    start-sleep 15 
    $global:NewWrite = Get-ChildItem "C:\Powershell Testing\$hostname.txt" 
    $global:Newsize = (Get-ChildItem "C:\Powershell Testing\$hostname.txt").length 
    $compareWrite = compare-object $OriginalWrite $NewWrite -property Name, lastwritetime | where-object {$_.SideIndicator -eq "=>"} 
    if($compareWrite) 
    { 
     write-host "$hostname has been modified" 
     $global:HasBeenModified = "Yes" 
     write-host "" 
    } 
    else 
    { 
     write-host "$hostname has not been modified" 
     $global:HasBeenModified = "No" 
     write-host "" 
    } 
} 

#####Check to see if an error log has been recorded. 
function CheckEventLog 
{ 
    write-host "Checking the following PC for error logs: $hostname" 
    $hostname | out-null; get-winevent -providername 'Microsoft-Windows-Backup' -computername $hostname | where {$_.id -eq "8" -and $_.timecreated -ge $GetCurrentDate} 
    $hostname | out-null; if(get-winevent -providername 'Microsoft-Windows-Backup' -computername $hostname | where {$_.id -eq "8" -and $_.timecreated -ge $GetCurrentDate}) 
    {  
       write-host "$comp received the following eventlog ID: 8" 
       $global:EventError = "Yes" 
       write-host "" 
    } 
} 

#####Check to see that the size has increased or decreased more than 5%. 
function CalculatePercentageDifference 
{ 
    $range = 5..-5 
    write-host "Checking the size difference for $hostname." 
    $b = $global:Newsize - $global:OriginaSize 
    $c = $b/$global:OriginaSize * 100 
    $RoundedNumber = [system.Math]::Round($c, 0) 
    #write-host $RoundedNumber "%" 
    if($range -contains $RoundedNumber) 
    { 
       write-host "$RoundedNumber%: There has not been a big enough change in the file size" 
       $global:SizeIsTooSmall = "Yes" 
       write-host "" 
    } 
    else 
    { 
       write-host "$RoundedNumber% falls within normal parameters." 
       write-host "" 
    } 
} 

#####################END FUNCTIONS################################################### 

Import-Csv $csvFile.FullName | %  { 
    $hostname = $_.hostname 
    $macaddr = $_.macaddr 

    Foreach ($_.hostname in $file) { 
     if ($ErrorMessage){ 
      $foreach.moveNext() 

      TurnOnPC 
      if($global:PCTurnOnError -eq 'Yes') 
      { 
       #write-host "$hostname did not turn on" 
       $ErrorMessage = "$hostname Did not turn on" 
       write-host "" 
       #email 
       continue 
      } 

      PingPC 
      if($global:PCPingError -eq 'Yes') 
      { 
       $ErrorMessage =  "$hostname is unreachable" 
       write-host "" 
       #email 
       continue 
      } 

      CheckWritePC 
      if($HasBeenModified -eq 'No') 
      { 
       #Write-host "No write" 
       $ErrorMessage = "  Backup file has not been written to"  
       #email 
       continue 
      } 

      CheckEventLog 
      if($EventError -eq 'Yes') 
      { 
       $ErrorMessage = "  Received an '8' winlog message" 
       #email 
       continue 
      } 
      else 
      { 
       write-host "No event errors recorded" 
       write-host "" 
      } 

      CalculatePercentageDifference 
      if($SizeIsTooSmall -eq 'Yes') 
      { 
       $ErrorMessage = "  The file size has not changed enough" 
       #email 
       continue 
      } 
     } 
    } 
}

来源

2012-03-06 Marvin Exeter

你没有做任何错误处理。如果您在PowerShell中遇到终止错误，则需要使用trap或使用try/catch来捕获错误。使用cmdlet时，您还可以使用-ErrorAction SilentlyContinue参数。

终止错误将停止所有执行。因此，您需要确定发生终止错误的位置并添加错误处理代码。

例如：

try { 
    1/$null 
} catch { 
    Write-Host ("The error was: " + $_) 
} 
Write-Host "Continuing..."

这try/catch结构将显示你的错误信息，但将允许继续执行。

又如：

trap { 
    Write-Host ("The error was: " + $_) 
} 
1/$null 
Write-Host "Continuing..."

来源

2012-03-06 09:29:12

Powershell foreach如果错误

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