使用 "select-string -pattern" 从文件中删除行时留空第一行

Question

我有一个看起来像这样的简单文本文件...

A,400000051115,null,null,null,null,null,null,null,20190312,090300,Answer Machine,2019,3,14,10,0
A,400000051117,null,null,null,null,null,null,null,20190312,090300,Confirmed,2019,3,14,10,30
A,400000051116,null,null,null,null,null,null,null,20190312,090300,Answer Machine,2019,3,14,11,0
A,400000051114,null,null,null,null,null,null,null,20190312,090300,Wants to Cancel,2019,3,14,9,0
A,400000051117,null,null,null,null,null,null,null,20190312,091800,SMS Sent,2019,3,14,10,30
A,400000051116,null,null,null,null,null,null,null,20190312,091800,SMS Sent,2019,3,14,11,0
A,400000051115,null,null,null,null,null,null,null,20190312,091800,SMS Sent,2019,3,14,10,0
A,400000051116,null,null,null,null,null,null,null,20190312,093000,Appointment Cancelled/Rescheduled Via SMS,2019,3,14,11,0

我需要将除 "SMS Sent" 之外的所有行保存到新文件中。我正在使用以下...

get-content $SourceFile.FullName | select-string -pattern 'SMS Sent' -notmatch | Out-File $targetFile

为什么在生成的文件中第一行是空白？

Answer 1

如果您将 Out-File $targetFile 更改为 Out-Host 或者甚至只是省略管道中的最后一段，您也会在控制台输出中看到一个空行。

Get-Content is Set-Content 的输出模拟，因此如果将 Out-File $targetFile 更改为 Set-Content $targetFile 第一行不再为空。

此外，由于您使用的是 CSV 文件，因此您可以使用 Import-CSV to read the data and Where-Object 来过滤该特定列，尽管需要一些额外的工作来指定 headers 并从中省略它们输出文件...

$csvHeaders = 1..17 | ForEach-Object -Process { "Column $_" }
$csvHeaders[11] = 'Status'

Import-Csv -Path $SourceFile.FullName -Header $csvHeaders `
    | Where-Object -Property 'Status' -NE -Value 'SMS Sent' `
    | ConvertTo-Csv -NoTypeInformation `
    | Select-Object -Skip 1 `
    | Set-Content $targetFile

...写...

"A","400000051115","null","null","null","null","null","null","null","20190312","090300","Answer Machine","2019","3","14","10","0"
"A","400000051117","null","null","null","null","null","null","null","20190312","090300","Confirmed","2019","3","14","10","30"
"A","400000051116","null","null","null","null","null","null","null","20190312","090300","Answer Machine","2019","3","14","11","0"
"A","400000051114","null","null","null","null","null","null","null","20190312","090300","Wants to Cancel","2019","3","14","9","0"
"A","400000051116","null","null","null","null","null","null","null","20190312","093000","Appointment Cancelled/Rescheduled Via SMS","2019","3","14","11","0"

...到 $targetFile。请注意，现在所有的值都被引用了。如果您的输入文件确实有 headers 那么您可以简单地使用...

Import-Csv -Path $SourceFile.FullName `
    | Where-Object -Property 'Status' -NE -Value 'SMS Sent' `
    | Export-Csv -NoTypeInformation -LiteralPath $targetFile

无论哪种情况，输出文件都不会包含前导空行。

使用 "select-string -pattern" 从文件中删除行时留空第一行

Blank first line when using "select-string -pattern" to strip lines from file

csv

powershell

select-string