使用powershell

Question

对不起伙计们......我是PowerShell的新手。如果有人帮助处理以下情况会很棒：

我在文件夹c：\ test

中有几个文件

sample.x.x.1
sample.x.x.2
sample.x.x.3
sample.x.x.4
sample.x.x.5

我想在给定文件夹中找到名称中编号最大的文件的名称。在上面的示例中，5是最高编号，脚本应将输出文件名作为sample.x.x.5

返回

提前致谢！

Answer 1

使用数字对文件名进行排序是一个很大的问题，因为有两种方法。第一个将它们设置为按字母顺序排列。也就是说，0, 1, 11, 111, 2,...第二个使用自然顺序。也就是0, 1, 2, 11, 111...。这非常棘手，每三个程序员都对此感到困惑。

已经有一个good answer，我会这样说，

# Create files 1..5
for($i=1;$i -le 5; ++$i) { set-content sample.x.x.$i -Value $null } 

# Tricksy! Create file .10 to confuse asciibetic/natural sorting
set-content sample.x.x.10 -Value $null

ls # Let's see the files

    Directory: C:\temp\test

Mode                LastWriteTime         Length Name
----                -------------         ------ ----
-a----       2015-09-28     10:29              0 sample.x.x.1
-a----       2015-09-28     10:29              0 sample.x.x.10
-a----       2015-09-28     10:29              0 sample.x.x.2
-a----       2015-09-28     10:29              0 sample.x.x.3
-a----       2015-09-28     10:29              0 sample.x.x.4
-a----       2015-09-28     10:29              0 sample.x.x.5

# Define helper as per linked answer
$ToNatural = { [regex]::Replace($_, '\d+$', { $args[0].Value.PadLeft20) }) }

# Sort with helper and check the output is natural result
gci | sort $ToNatural -Descending | select -First 1

Directory: C:\temp\test

Mode                LastWriteTime         Length Name
----                -------------         ------ ----
-a----       2015-09-28     10:29              0 sample.x.x.10

Answer 2

按字母排序。

using Akka.Actor;
using Akka.Event;

namespace Foo {
  public class DeadLetterAwareActor : ReceiveActor {
    protected ILoggingAdapter Log = Context.GetLogger();

    public DeadLetterAwareActor() {
      // subscribe to DeadLetters in ActorSystem EventStream
      Context.System.EventStream.Subscribe(Self, typeof(DeadLetter));
      Receiving();
    }

    private void Receiving() {
      // is it my message being delivered to DeadLetters?
      Receive<DeadLetter>(msg => msg.Sender.Equals(Self), msg => {
        Log.info("My message to {0} was not delivered :(", msg.Recipient);
      })
    }
  }
}

数字排序。

PS C:\Users\Gebb> @("sample.x.x.1", "sample.x.x.5", "sample.x.x.11") | sort
sample.x.x.1
sample.x.x.11
sample.x.x.5

最大数字。

PS C:\Users\Gebb> @("sample.x.x.1", "sample.x.x.5", "sample.x.x.11") |
 sort -Property @{Expression={[Int32]($_ -split '\.' | select -Last 1)}}
sample.x.x.1
sample.x.x.5
sample.x.x.11