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[转载代码] [PowerShell每日技巧]查看一天内的错误事件日志(20140312)

Relative dates are important to get data within a special time frame, avoiding hard-coded dates and times.

This script will get all error and warning events from the System log since yesterday (24 hours ago):
  1. $today = Get-Date
  2. $1day = New-TimeSpan -Days 1
  3. $yesterday = $today - $1day
  4. Get-EventLog -LogName system -EntryType Error, Warning -After $yesterday
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http://powershell.com/cs/blogs/tips/archive/2014/03/12/finding-errors-since-yesterday.aspx

For those looking for a one-liner alternative, you can use the AddDays method as shown in the following command to retrieve events for the last 24 hours.
  1. Get-EventLog -LogName system -EntryType Error, Warning -After (Get-Date).AddDays(-1)
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To retrieve events from yesterday starting at midnight, use the Date method prior to AddDays.
  1. Get-EventLog -LogName system -EntryType Error, Warning -After (Get-Date).Date.AddDays(-1)
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I want to get all error and warning events from the System log since yesterday start of day.
  1. $yesterday1200AM = ( [datetime](Get-Date).ToShortDateString()).adddays(-1)
  2. $yesterday1200AM
  3. Get-EventLog -LogName system -EntryType Error, Warning -After $yesterday1200AM
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C:\Users\Admin>powershell -file "C:\Users\Admin\Desktop\test.ps1"
无法加载文件 C:\Users\Admin\Desktop\test.ps1,因为在此系统中禁止执行脚本。有关
详细信息,请参阅 "get-help about_signing"。
    + CategoryInfo          : NotSpecified: ( [], ParentContainsErrorRecordE
   xception
    + FullyQualifiedErrorId : RuntimeException

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回复 4# 522235677
  1. Set-ExecutionPolicy Unrestricted
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http://www.bathome.net/thread-26149-1-1.html

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