Hastebin

#!/usr/bin/env -S pwsh -nop

param (

    [Parameter()][switch] $g,
    [Parameter()][switch] $m,
    [Parameter()][switch] $k
)

$dec = [Globalization.CultureInfo]::CurrentCulture.NumberFormat.NumberDecimalDigits
$sep = [Globalization.CultureInfo]::CurrentCulture.NumberFormat.NumberDecimalSeparator

[Globalization.CultureInfo]::CurrentCulture.NumberFormat.NumberDecimalSeparator = '.'


$raw = (Get-Content /proc/meminfo) -replace '\sKB' | Out-String | ConvertFrom-StringData -Delimiter ':'

$data = @{}

foreach ($i in $raw.Keys) { $data.Add($i, ([int64] $raw.$i * 1kb)) }

$digit, $unit =
switch ($PSBoundParameters.Keys)
{
        'g' { 1gb, 'GB' }
        'm' { 1mb, 'MB' }
        'k' { 1kb, 'KB' }
}

if (-not $digit) { $unit = 'bytes' }
else
{
    [float] $data.MemTotal /= $digit
    [float] $data.MemFree /= $digit
    [float] $data.Cached /= $digit
    [float] $data.Buffers /= $digit
}

$used = $data.MemTotal - $data.MemFree - $data.Cached - $data.Buffers

$data.Add('Used', $used)

if ($unit -match 'bytes|KB') { [Globalization.CultureInfo]::CurrentCulture.NumberFormat.NumberDecimalDigits = 0 }

[pscustomobject] @{

    Total = [math]::Round($data.MemTotal,2)
    Free = [math]::Round($data.MemFree,2)
    Used = [math]::Round($data.Used,2)
    Cached = [math]::Round($data.Cached,2)
    Buffers = [math]::Round($data.Buffers,2)
    Units = $unit
}

[Globalization.CultureInfo]::CurrentCulture.NumberFormat.NumberDecimalDigits = $dec
[Globalization.CultureInfo]::CurrentCulture.NumberFormat.NumberDecimalSeparator = $sep