如何循环遍历文件直到第n个定界符并打印输出

Question

我有一个文件，其中有多行由定界符“ |”分隔 在下面的示例中，我有5个“ |”定界符。因此，有6条消息。现在我要3条消息。

InputFile.txt

Line1
Line2
Line3
|
Line4
Line5
|
Line6
|
Line7
|
Line8
Line9
|
Line10

输出：

Line1
Line2
Line3
|
Line4
Line5
|
Line6

Answer 1

只需在此处扔另一个选项即可

(Get-Content '.\InputFile.txt' -Raw).Split('|')[0..2] -join '|'

Answer 2

使用Get-Content获取文件的各行，并使用for循环逐行输出它们：

# Set the delimiter character and get the file contents
$delimiter = '|'
$content = Get-Content $filePath

# Loop over each line, set the delimiter count
$delimCount = 0
foreach( $line in $content ){

  # If the line equals the delimiter and the delimiter count is 3, exit the loop
  # ++$variable increments the variable by 1, then evaluates it
  # The right side of an -and is not evaulated if the left side is $False
  if( $line -eq $delimiter -and ++$delimCount -ge 3 ) {
    break;
  }

  # Output the line
  $line
}

Answer 3

计数到组标记，然后退出。

$groupcount = 0

Get-Content -Path '.\InputFile.txt' |
    ForEach-object {
        if ($_ -eq '|') {
            $groupcount++
            if ($groupcount -eq 3) { break }
        }
        if ($groupcount -lt 3) { Write-Output $_ }
    }