PowerShell历史记录：如何防止重复的命令？

问题描述

背景：

由于我有一种保存跨会话历史记录的方法，因此PowerShell历史记录对我有用得多。

PowerShell history is a lot more useful to me now that I have a way to save history across sessions.

# Run this every time right before you exit PowerShell
get-history -Count $MaximumHistoryCount | export-clixml $IniFileCmdHistory;

现在，我正试图防止PowerShell将重复的命令保存到我的历史记录中。

Now, I am trying to prevent PowerShell from saving duplicate commands to my history.

我尝试使用 Get-Unique ，但是由于历史记录中的 every 命令是唯一，因为每个人都有不同的ID号。

I tried using Get-Unique, but that doesn't work since every command in the history is "unique", because each one has a different ID number.

推荐答案

Get-Unique也需要一个排序列表，我认为您可能希望
保留执行顺序。

Get-Unique also requires a sorted list and I assume you probably want topreserve execution order. Try this instead

Get-History -Count 32767 | Group CommandLine | Foreach {$_.Group[0]} |
Export-Clixml "$home\pshist.xml"

此方法使用了Group -Object cmdlet创建唯一的命令桶
，然后Foreach-Object块仅抓取每个桶中的第一项。

This approach uses the Group-Object cmdlet to create unique buckets of commandsand then the Foreach-Object block just grabs the first item in each bucket.

BTW如果要所有命令保存到历史文件中，我将使用限制值
-32767-除非您将$ MaximumHistoryCount设置为该值。

BTW if you want all commands saved to a history file I would use the limit value- 32767 - unless that is what you set $MaximumHistoryCount to.

BTW如果要自动保存退出时，您可以在2.0上执行此操作，例如
，

BTW if you want to automatically save this on exit you can do this on 2.0 likeso

Register-EngineEvent PowerShell.Exiting {
  Get-History -Count 32767 | Group CommandLine |
  Foreach {$_.Group[0]} | Export-CliXml "$home\pshist.xml" } -SupportEvent

然后在全部加载后还原您需要的是

Then to restore upon load all you need is

Import-CliXml "$home\pshist.xml" | Add-History

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