在PowerShell中联接数组，类似于串联DataFrame列 [英] Join arrays in PowerShell similar to concatenating DataFrame columns

问题描述

有没有一种方法可以在PowerShell中联接数组，类似于在Python Pandas中将DataFrame列与concat或在R中与cbind串联，而不是遍历每个项目?

Is there a way to join arrays in PowerShell similar to concatenating DataFrame columns in Python Pandas with concat or in R with cbind rather than iterating through every item?

下面是一个可重现的示例，该示例将四个数组作为PowerShell对象中的四列绑定在一起.如何摆脱for循环并获得相同的结果?

Below is a reproducible example that binds four arrays together as four columns in a PowerShell object. How would I get rid of the for loop and get the same results?

$LogicalProcessors = (Get-WmiObject –class Win32_processor 
    -Property NumberOfLogicalProcessors).NumberOfLogicalProcessors;

function myTop([String]$SortCol='CPU', [Int32]$top=30) {
    $NameArray = get-counter '\Process(*)\ID Process' -EA SilentlyContinue | 
        Select -Expand CounterSamples | Select InstanceName, CookedValue
    $CpuArray = get-counter '\Process(*)\% Processor Time' -EA SilentlyContinue | 
        Select -Expand CounterSamples | Select CookedValue
    $MemArray = get-counter '\Process(*)\Working Set - Private' -EA SilentlyContinue | 
        Select -Expand CounterSamples | Select CookedValue

    $TopTable = For ($i=0; $i -lt $NameArray.Length; $i++) {
            if ($NameArray[$i].InstanceName -eq '_total') {continue}
            if ($NameArray[$i].InstanceName -eq 'memory compression') {continue}
            if ($NameArray[$i].InstanceName -eq 'idle') {
                $CPU = ($CpuArray[$i].CookedValue) / $LogicalProcessors;
            } else {
                $CPU = $CpuArray[$i].CookedValue;
            }
            [PSCustomObject]@{
                Name = $NameArray[$i].InstanceName;
                ID = $NameArray[$i].CookedValue;
                CPU = $CPU;
                Memory = $MemArray[$i].CookedValue;
            }
    }

    $TopTable | sort -des $SortCol | select -f $top |`
    select Name, ID,`
        @{Name='CPU'; Expression = {("{0:N1}%" -f $_.CPU) } },`
        @{Name='Memory'; Expression = {("{0:N0} K" -f ($_.Memory /1kb) )} }
}

myTop -SortCol Memory -top 30 | ft -a

推荐答案

我认为PowerShell无法提供组合列的方法.在这种情况下，它可以对应Group-Object.

I think PowerShell doesn't provide a way to combine columns. In this case, it can correspond by Group-Object.

function myTop([string]$SortCol = "CPU", [int]$Top = 30)
{
    $LogicalProcessors = (Get-WmiObject Win32_processor NumberOfLogicalProcessors).NumberOfLogicalProcessors

    Get-Counter '\Process(*)\ID Process','\Process(*)\% Processor Time','\Process(*)\Working Set - Private' -ea SilentlyContinue |
    foreach CounterSamples |
    where InstanceName -notin "_total","memory compression" |
    group { $_.Path.Split("\\")[3] } |
    foreach {
        [pscustomobject]@{
            Name = $_.Group[0].InstanceName
            ID = $_.Group[0].CookedValue
            CPU = if($_.Name -eq "idle") { $_.Group[1].CookedValue / $LogicalProcessors } else { $_.Group[1].CookedValue } 
            Memory = $_.Group[2].CookedValue / 1KB
        }
    } |
    sort -des $SortCol |
    select -f $Top @(
        "Name","ID"
        @{ n = "CPU"; e = { ("{0:N1}%" -f $_.CPU) } }
        @{ n = "Memory"; e = { ("{0:N0} K" -f $_.Memory) } }
    )
}

myTop -SortCol Memory -top 10 | ft -a

这篇关于在PowerShell中联接数组，类似于串联DataFrame列的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！