使用PowerShell,可以使用“Write-Host”覆盖一行

时间:2014-01-28 18:49:33

标签: powershell

我有一个简单的文件munging实用程序,我想提供一些进度反馈而不在控制台上创建“滚动风暴”。我试过这个:

param([string] $input = "", [string] $output = "")

$source = $PSBoundParameters["input"] 
$destination = $PSBoundParameters["output"]

if (!$source) 
    {exit}

if (!$destination) 
    { 
        $destination = [System.IO.Path]::GetDirectoryName($source) `
        + "\fmt_" `
        + [System.IO.Path]::GetFileName($source)

    }

$reader = [System.IO.File]::OpenText($source)
$writer = [System.IO.file]::CreateText($destination)

$lineNo = 0
try {
    for(;;) {
        $line = $reader.ReadLine()
        if ($line -eq $null) { break }
        $lineNo++
        Write-Host "Processing line #:" $lineNo -NoNewline "`r"
        #process the line...
        $writer.Writeline($line)
    }
}
finally {
    $reader.Close()
    $writer.Close()
}

我得到的输出如下:

Processing line #:  1 Processing line #:  2 Processing line #:  3 ...

看来回车无法识别或被剥离。有没有办法解决这个与Write-Host?

如果没有,PowerShell新手会怎样覆盖写入控制台的最后一行?

2 个答案:

答案 0 :(得分:1)

试试这个:

gci *.txt |% {write-host "`r$($_.name)" -NoNewline; Start-Sleep -Seconds 1}

答案 1 :(得分:1)

修改Write-Host行,如下所示:

Write-Host "`rProcessing line #: $lineNo" -NoNewline