How can i format correctly the "Size" param at Get-Partition?-CodePudding

When i use get-partition i get something like that:

PartitionNumber                                   Size Type
---------------                                   ---- ----
1                                            931.51 GB IFS

As you can see, the Size is correctly formatted with GB behind.

When I use:

get-partition | select Size

         Size
         ----
    104857600

i get the size in the wrong format. is it possible to get it like the upper one without math functions?

CodePudding user response：

If you just want to print the sizes expressed in GB with two decimal places, with suffix GB, do the following:

Get-Partition | ForEach-Object { '{0:N2} GB' -f ($_.Size / 1gb) }

^{If you also want a column header, use Format-Table with a calculated property as follows:

Format-Table @{ Name='Size'; Expression={ '{0:N2} GB' -f ($_.Size / 1gb) } }. You could use the same technique with Select-Object, but since for-display formatting is the goal here, that isn't necessary.}

If you want to auto-scale the sizes (using simulated input objects to demonstrate, via PowerShell's number-literal suffixes such as kb, which are multiples of 1024):

@{ Size = 42 }, 
@{ Size = 42.1kb }, 
@{ Size = 42.2mb }, 
@{ Size = 42.3gb }, 
@{ Size = 42.4tb },
@{ Size = 42.4pb } |
  ForEach-Object { 
    $decimalPlaces = 2
    $scaledSize = switch ($_.Size) {
      { $_ -ge 1pb } { $_ / 1pb; $suffix='PB'; break }
      { $_ -ge 1tb } { $_ / 1tb; $suffix='TB'; break }
      { $_ -ge 1gb } { $_ / 1gb; $suffix='GB'; break }
      { $_ -ge 1mb } { $_ / 1mb; $suffix='MB'; break }
      { $_ -ge 1kb } { $_ / 1kb; $suffix='KB'; break }
      default        { $_; $suffix='B'; $decimalPlaces = 0 }
    }

    "{0:N${decimalPlaces}} $suffix" -f $scaledSize
  }

Output:

42 B
42.10 KB
42.20 MB
42.30 GB
42.40 TB
42.40 PB

Note: The auto-scaling code above is essentially a more readable formulation of what PowerShell does in its default for-display formatting for the output objects emitted by Get-Partition, via their Microsoft.Management.Infrastructure.CimInstance#MSFT_Partition ETS type name; specifically, the code used is:

$size = $_.Size;
$postfixes = @( "B", "KB", "MB", "GB", "TB", "PB" )
for ($i=0; $size -ge 1024 -and $i -lt $postfixes.Length; $i  ) { $size = $size / 1024; }
return ""   [System.Math]::Round($size,2)   " "   $postfixes[$i];

CodePudding user response：

Is using math to round the number ok?

Get-Partition | Select DriveLetter, PartitionNumber, @{Label = "Size"; Expression = { [math]::round($_.Size / 1gb, 2) } }