对于那些以“打字越少越好”为原则的管理员来说，下面是我能找到的最短版本:

gc filename -wai -ta 10

可以从这个GitHub存储库下载为Windows编译的所有UNIX命令:https://github.com/George-Ogden/UNIX

从PowerShell 3.0版本开始，Get-Content cmdlet有一个-Tail参数，这应该会有所帮助。关于Get-Content，请参阅technet库的在线帮助。

使用Powershell V2及以下版本时，get-content读取整个文件，因此对我来说没有任何用处。下面的代码可以满足我的需要，尽管字符编码可能存在一些问题。这实际上是tail -f，但是可以很容易地修改它以获得最后x个字节，或者如果您想向后搜索换行符，则可以修改它以获得最后x行。

$filename = "\wherever\your\file\is.txt"
$reader = new-object System.IO.StreamReader(New-Object IO.FileStream($filename, [System.IO.FileMode]::Open, [System.IO.FileAccess]::Read, [IO.FileShare]::ReadWrite))
#start at the end of the file
$lastMaxOffset = $reader.BaseStream.Length

while ($true)
{
    Start-Sleep -m 100

    #if the file size has not changed, idle
    if ($reader.BaseStream.Length -eq $lastMaxOffset) {
        continue;
    }

    #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
}

我在这里找到了大部分代码。

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.

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