为什么我在此脚本中发现空管道错误

时间:2015-11-16 20:59:08

标签: powershell

我是一位非常新手的Powershell学生,他的任务是让以下代码正常工作,并且我在标记的行中不断收到空管道错误,并给出空管道错误'。经过几个小时的研究,我仍然难以理解是什么导致了这一点。该脚本应该搜索Application.evtx日志并返回过去24小时内的任何错误。我非常感谢能帮助我指明正确方向的任何帮助。 这是代码:

#look for Errors script

#Creates Function named CheckLogs
Function CheckLogs()
{
    # Defines a named parameter $logfile as a string
    param ([string]$logfile)

    if(!$logfile) {write-host "Usage: ""C:\Windows\System32\winevt\Logs\Application.evtx"""; exit}

    # Accesses the file stored in $logfile variable and looks for the string "ERROR" 
    cat $logfile | Select-string "ERROR" -SimpleMatch |select -expand line |

        foreach

        {

            $_ -match '(.+)\s\[(ERROR)\]\S(.+)'| Out-Null

            new-object psobject -Property@{Timestamp=[datetime]$matches[1];Error=$matches[2]}

| #Gives Empty Pipeline Error

            where {$_.timestamp -gt (get-date).AddDays(-1)}

            $error_time=[datetime]($matches[1])

            if ($error_time -gt (Get-Date).AddDays(-1))

            {
                write-output "CRITICAL: There is an error in the log file $logfile around

                    $($error_time.ToShortTimeString( ))"; exit(2)

            }
        }

    write-output "OK: There were no errors in the past 24 hours."

}

CheckLogs "C:\Windows\System32\winevt\Logs\Application.evtx" #Function Call

1 个答案:

答案 0 :(得分:1)

您不能将管道|字符单独放在一行上。您可以使用|结束一行,然后在下一行继续管道。

这应该有效:

new-object psobject -Property@{Timestamp=[datetime]$matches[1];Error=$matches[2]} | 
where {$_.timestamp -gt (get-date).AddDays(-1)}