du in PowerShell? - windows

Question

How can I get a du-ish analysis using PowerShell? I'd like to periodically check the size of directories on my disk.
The following gives me the size of each file in the current directory:
foreach ($o in gci)
{
Write-output $o.Length
}
But what I really want is the aggregate size of all files in the directory, including subdirectories. Also I'd like to be able to sort it by size, optionally.

Answer 1

There is an implementation available at the "Exploring Beautiful Languages" blog:
"An implementation of 'du -s *' in Powershell"
function directory-summary($dir=".") {
get-childitem $dir |
% { $f = $_ ;
get-childitem -r $_.FullName |
measure-object -property length -sum |
select #{Name="Name";Expression={$f}},Sum}
}
(Code by the blog owner: Luis Diego Fallas)
Output:
PS C:\Python25> directory-summary
Name Sum
---- ---
DLLs 4794012
Doc 4160038
include 382592
Lib 13752327
libs 948600
tcl 3248808
Tools 547784
LICENSE.txt 13817
NEWS.txt 88573
python.exe 24064
pythonw.exe 24576
README.txt 56691
w9xpopen.exe 4608

Answer 2

I modified the command in the answer slightly to sort descending by size and include size in MB:
gci . |
%{$f=$_; gci -r $_.FullName |
measure-object -property length -sum |
select #{Name="Name"; Expression={$f}},
#{Name="Sum (MB)";
Expression={"{0:N3}" -f ($_.sum / 1MB) }}, Sum } |
sort Sum -desc |
format-table -Property Name,"Sum (MB)", Sum -autosize
Output:
PS C:\scripts> du
Name Sum (MB) Sum
---- -------- ---
results 101.297 106217913
SysinternalsSuite 56.081 58805079
ALUC 25.473 26710018
dir 11.812 12385690
dir2 3.168 3322298
Maybe it is not the most efficient method, but it works.

Answer 3

If you only need the total size of that path, one simplified version can be,
Get-ChildItem -Recurse ${HERE_YOUR_PATH} | Measure-Object -Sum Length

Answer 4

function Get-DiskUsage ([string]$path=".") {
$groupedList = Get-ChildItem -Recurse -File $path | Group-Object directoryName | select name,#{name='length'; expression={($_.group | Measure-Object -sum length).sum } }
foreach ($dn in $groupedList) {
New-Object psobject -Property #{ directoryName=$dn.name; length=($groupedList | where { $_.name -like "$($dn.name)*" } | Measure-Object -Sum length).sum }
}
}
Mine is a bit different; I group all of the files on directoryname, then walk through that list building totals for each directory (to include the subdirectories).

Answer 5

Building on previous answers, this will work for those that want to show sizes in KB, MB, GB, etc., and still be able to sort by size. To change units, just change "MB" to desired units in both "Name=" and "Expression=". You can also change the number of decimal places to show (rounding), by changing the "2".
function du($path=".") {
Get-ChildItem $path |
ForEach-Object {
$file = $_
Get-ChildItem -File -Recurse $_.FullName | Measure-Object -Property length -Sum |
Select-Object -Property #{Name="Name";Expression={$file}},
#{Name="Size(MB)";Expression={[math]::round(($_.Sum / 1MB),2)}} # round 2 decimal places
}
}
This gives the size as a number not a string (as seen in another answer), therefore one can sort by size. For example:
PS C:\Users\merce> du | Sort-Object -Property "Size(MB)" -Descending
Name Size(MB)
---- --------
OneDrive 30944.04
Downloads 401.7
Desktop 335.07
.vscode 301.02
Intel 6.62
Pictures 6.36
Music 0.06
Favorites 0.02
.ssh 0.01
Searches 0
Links 0

Answer 6

My own take using the previous answers:
function Format-FileSize([int64] $size) {
if ($size -lt 1024)
{
return $size
}
if ($size -lt 1Mb)
{
return "{0:0.0} Kb" -f ($size/1Kb)
}
if ($size -lt 1Gb)
{
return "{0:0.0} Mb" -f ($size/1Mb)
}
return "{0:0.0} Gb" -f ($size/1Gb)
}
function du {
param(
[System.String]
$Path=".",
[switch]
$SortBySize,
[switch]
$Summary
)
$path = (get-item ".").FullName
$groupedList = Get-ChildItem -Recurse -File $Path |
Group-Object directoryName |
select name,#{name='length'; expression={($_.group | Measure-Object -sum length).sum } }
$results = ($groupedList | % {
$dn = $_
if ($summary -and ($path -ne $dn.name)) {
return
}
$size = ($groupedList | where { $_.name -like "$($dn.name)*" } | Measure-Object -Sum length).sum
New-Object psobject -Property #{
Directory=$dn.name;
Size=Format-FileSize($size);
Bytes=$size`
}
})
if ($SortBySize)
{ $results = $results | sort-object -property Bytes }
$results | more
}