PowerShell display files size as KB, MB, or GB

Question

I have a section of a PowerShell script that gets the file size of a specified directory.

I am able to get the values for different units of measurement into variables, but I don't know a good way to display the appropriate one.

$DirSize = "{0:N2}" -f (($DirArray | Measure-Object -property length -sum).sum)
$DirSizeKB = "{0:N2}" -f (($DirArray | Measure-Object -property length -sum).sum / 1KB)
$DirSizeMB = "{0:N2}" -f (($DirArray | Measure-Object -property length -sum).sum / 1MB)
$DirSizeGB = "{0:N2}" -f (($DirArray | Measure-Object -property length -sum).sum / 1GB)

If the number of bytes is at least 1 KB I want the KB value displayed. If the number of KBs is at least 1 MB I want MBs displayed and so on.

Is there a good way to accomplish this?

Answer 1

There are lots of ways to do this. Here's one:

switch -Regex ([math]::truncate([math]::log($bytecount,1024))) {

    '^0' {"$bytecount Bytes"}

    '^1' {"{0:n2} KB" -f ($bytecount / 1KB)}

    '^2' {"{0:n2} MB" -f ($bytecount / 1MB)}

    '^3' {"{0:n2} GB" -f ($bytecount / 1GB)}

    '^4' {"{0:n2} TB" -f ($bytecount / 1TB)}

     Default {"{0:n2} PB" -f ($bytecount / 1pb)}
}