非常基本，但不需要任何附加模块或PS版本要求:

while ($true){清除主机;gc E:\test.txt | select -last 3;睡眠2}

为了完整起见，我将提到Powershell 3.0现在在Get-Content上有一个-Tail标志

Get-Content ./log.log -Tail 10

获取文件的最后10行

Get-Content ./log.log -Wait -Tail 10

获取文件的最后10行并等待更多

另外，对于那些*nix用户，请注意大多数系统将cat别名为Get-Content，因此这通常是可行的

cat ./log.log -Tail 10

对Get-Content使用-wait参数，它将显示添加到文件中的行。这个特性在PowerShell v1中就有了，但是由于某种原因在v2中没有很好地记录。

这里有一个例子

Get-Content -Path "C:\scripts\test.txt" -Wait

运行此命令后，更新并保存该文件，您将在控制台上看到更改。

非常基本，但不需要任何附加模块或PS版本要求:

while ($true){清除主机;gc E:\test.txt | select -last 3;睡眠2}

PowerShell Community Extensions (PSCX)提供了Get-FileTail cmdlet。这看起来是一个适合这项任务的解决方案。注意:我没有尝试它与非常大的文件，但描述说，它有效地尾部内容，它是为大型日志文件设计的。

NAME
    Get-FileTail

SYNOPSIS
    PSCX Cmdlet: Tails the contents of a file - optionally waiting on new content.

SYNTAX
    Get-FileTail [-Path] <String[]> [-Count <Int32>] [-Encoding <EncodingParameter>] [-LineTerminator <String>] [-Wait] [<CommonParameters>]

    Get-FileTail [-LiteralPath] <String[]> [-Count <Int32>] [-Encoding <EncodingParameter>] [-LineTerminator <String>] [-Wait] [<CommonParameters>]

DESCRIPTION
    This implentation efficiently tails the cotents of a file by reading lines from the end rather then processing the entire file. This behavior is crucial for ef
    ficiently tailing large log files and large log files over a network.  You can also specify the Wait parameter to have the cmdlet wait and display new content
    as it is written to the file.  Use Ctrl+C to break out of the wait loop.  Note that if an encoding is not specified, the cmdlet will attempt to auto-detect the
     encoding by reading the first character from the file. If no character haven't been written to the file yet, the cmdlet will default to using Unicode encoding
    . You can override this behavior by explicitly specifying the encoding via the Encoding parameter.

我采用了@hajamie的解决方案，并将其包装到一个更方便的脚本包装器中。

我添加了一个选项，从文件结束之前的偏移量开始，因此您可以使用类似尾部的功能，从文件结束处读取一定量的数据。注意偏移量是以字节为单位的，而不是行。

你还可以选择继续等待更多内容。

示例(假设您将其保存为TailFile.ps1):

.\TailFile.ps1 -File .\path\to\myfile.log -InitialOffset 1000000
.\TailFile.ps1 -File .\path\to\myfile.log -InitialOffset 1000000 -Follow:$true
.\TailFile.ps1 -File .\path\to\myfile.log -Follow:$true

这是脚本本身……

param (
    [Parameter(Mandatory=$true,HelpMessage="Enter the path to a file to tail")][string]$File = "",
    [Parameter(Mandatory=$true,HelpMessage="Enter the number of bytes from the end of the file")][int]$InitialOffset = 10248,
    [Parameter(Mandatory=$false,HelpMessage="Continuing monitoring the file for new additions?")][boolean]$Follow = $false
)

$ci = get-childitem $File
$fullName = $ci.FullName

$reader = new-object System.IO.StreamReader(New-Object IO.FileStream($fullName, [System.IO.FileMode]::Open, [System.IO.FileAccess]::Read, [IO.FileShare]::ReadWrite))
#start at the end of the file
$lastMaxOffset = $reader.BaseStream.Length - $InitialOffset

while ($true)
{
    #if the file size has not changed, idle
    if ($reader.BaseStream.Length -ge $lastMaxOffset) {
        #seek to the last max offset
        $reader.BaseStream.Seek($lastMaxOffset, [System.IO.SeekOrigin]::Begin) | out-null

        #read out of the file until the EOF
        $line = ""
        while (($line = $reader.ReadLine()) -ne $null) {
            write-output $line
        }

        #update the last max offset
        $lastMaxOffset = $reader.BaseStream.Position
    }

    if($Follow){
        Start-Sleep -m 100
    } else {
        break;
    }
}