在继续使用新Csv之前，是否可以为导出Csv指定要写入的最大行数？（拆分文件）

此脚本审核共享并创建一个CSV，详细说明找到的文件名及其文件扩展名信息-这很好。问题是CSV的行数往往超过Excel所能打开的行数。有没有一种方法可以分割文件？比如说在x行数之后创建一个新的CSV文件

# changes PowerShell prompt to the directory the script is being executed from

function Get-ScriptDirectory {
    $Invocation = (Get-Variable MyInvocation -Scope 1).Value
    Split-Path $Invocation.MyCommand.Path
}

$ISEScriptPath = Split-Path -Parent $psISE.CurrentFile.Fullpath -EA SilentlyContinue

if ($ISEScriptPath -eq $null) {
    cd $(Get-ScriptDirectory -EA SilentlyContinue)
} else {
    cd $ISEScriptPath
}

# checks for logs directory - if directory does not exist creates it
$Logs = Test-Path "$PWD\Logs"
if (-not $Logs) {
    md "$PWD\Logs"
}

############# Main Script ################

$servers = Get-content .\servers.txt          # servers.txt should be in script location containing list of servers to be audited
$share = "e$"                                 # change this to audit location 

foreach ($server in $servers) {
    $now = get-date -format _HHmm_dd-MM-yyyy

    # User Config
    $report = ("FileExtAudit_"+ $server + "_" + $share + "$now.csv") # Name of the file to write out to.
    $scanFrom = "\\$server\$share" # Script will audit this location and everything below (if it has permissions..)

    gci $scanFrom -recurse | ? {$_.PSIsContainer -eq $False} |
        Select-Object DirectoryName, Name, Extension, Length, LastAccessTime,
            @{l="HSM";e={if( $_.Attributes -match "Compressed"){"True"} else {"False"} }},
            @{l="ACL";e={[string]((Get-Acl $_.FullName).Owner)}} |
        Export-Csv "$PWD\Logs\$report" -NoTypeInformation 
}

---

您可以将结果保存到变量中，并使用

.Count

方法对其进行迭代，然后自己拆分。（

select-first X

或

select-index 1000..1999

等）

导出Csv

不支持将输入拆分为多个文件。您必须自己实现逻辑

$maxRecords = 500  # maximum number of records per CSV
$now = Get-Date

foreach ($server in $servers) {
    Get-ChildItem "\\$server\$share" -Recurse |
        Where-Object { $_.PSIsContainer -eq $False } |
        Select-Object DirectoryName, Name, Extension, Length, LastAccessTime,
            @{l="HSM";e={ if ( $_.Attributes -match "Compressed") {$true} else {$false} }},
            @{l="ACL";e={ (Get-Acl $_.FullName).Owner }} |
        ForEach-Object -Begin {$i = 0} -Process {
            if ($i % $maxRecords -eq 0) {
                if ($writer) {
                    $writer.Close()
                    $writer.Dispose()
                }
                $index  = [int][math]::Floor([int]$i/[int]$maxRecords)
                $report = 'FileExtAudit_{0}_{1}_{2:HHmm_dd-MM-yyyy}_{3:d3}.csv' -f $server, $share, $now, $index
                $writer = [IO.StreamWriter]"$PWD\Logs\$report"
                $writer.WriteLine('"DirectoryName","Name","Extension","Length","LastAccessTime","HSM","ACL"')
            }
            $writer.WriteLine(('"{0}","{1}","{2}","{3}","{4}","{5}","{6}"' -f $_.DirectoryName, $_.Name, $_.Extension, $_.Length, $_.LastAccessTime, $_.HSM, $_.ACL))
            $i++
        }

    if ($writer) {
        $writer.Close()
        $writer.Dispose()
    }
}

在循环中追加可能不是实现这一点的最优雅的方式，但它可以在代码中不做重大更改的情况下工作，同时还可以避免在变量中收集结果：

$maxRecords = 500  # maximum number of records per CSV
$now = Get-Date

foreach ($server in $servers) {
    Get-ChildItem "\\$server\$share" -Recurse |
        Where-Object { -not $_.PSIsContainer } |
        Select-Object DirectoryName, Name, Extension, Length, LastAccessTime,
            @{l="HSM";e={ if ( $_.Attributes -match "Compressed") {$true} else {$false} }},
            @{l="ACL";e={ (Get-Acl $_.FullName).Owner }} |
        ForEach-Object -Begin {$i = 0} -Process {
            $index  = [int][math]::Floor([int]$i/[int]$maxRecords)
            $report = 'FileExtAudit_{0}_{1}_{2:HHmm_dd-MM-yyyy}_{3:d3}.csv' -f $server, $share, $now, $index
            $_ | Export-Csv "$PWD\Logs\$report" -NoType -Append
            $i++
        }
}

从性能PoV来看，使用

StreamWriter

将是一个更好的选择（不仅它本身进出速度更快，而且还可以避免重复关闭和重新打开输出文件）。但是，它需要更精细的处理，您还需要自己构建CSV行

$maxRecords = 500  # maximum number of records per CSV
$now = Get-Date

foreach ($server in $servers) {
    Get-ChildItem "\\$server\$share" -Recurse |
        Where-Object { $_.PSIsContainer -eq $False } |
        Select-Object DirectoryName, Name, Extension, Length, LastAccessTime,
            @{l="HSM";e={ if ( $_.Attributes -match "Compressed") {$true} else {$false} }},
            @{l="ACL";e={ (Get-Acl $_.FullName).Owner }} |
        ForEach-Object -Begin {$i = 0} -Process {
            if ($i % $maxRecords -eq 0) {
                if ($writer) {
                    $writer.Close()
                    $writer.Dispose()
                }
                $index  = [int][math]::Floor([int]$i/[int]$maxRecords)
                $report = 'FileExtAudit_{0}_{1}_{2:HHmm_dd-MM-yyyy}_{3:d3}.csv' -f $server, $share, $now, $index
                $writer = [IO.StreamWriter]"$PWD\Logs\$report"
                $writer.WriteLine('"DirectoryName","Name","Extension","Length","LastAccessTime","HSM","ACL"')
            }
            $writer.WriteLine(('"{0}","{1}","{2}","{3}","{4}","{5}","{6}"' -f $_.DirectoryName, $_.Name, $_.Extension, $_.Length, $_.LastAccessTime, $_.HSM, $_.ACL))
            $i++
        }

    if ($writer) {
        $writer.Close()
        $writer.Dispose()
    }
}

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它需要在PowerShell 2.0上运行吗？不，我还可以访问PowerShell 3.0和4.0