Review one PowerShell script like an engineer

Guide 1 min read Windows PowerShell 5.1 and PowerShell 7

Written and tested by Dhrub Bharali · Updated 02 October 2026

The goal is not to crown the cleverest one-liner. It is to make a useful script easier to trust, reuse and maintain.

Overview

SCRIPT OF THE WEEK

1PS> param([string[]]$ComputerName)

2PS>

3PS> foreach ($computer in $ComputerName) {

4PS> try {

5PS> $diskParams = @{

6PS> ComputerName = $computer

7PS> Filter = 'DriveType=3'

8PS> ErrorAction = 'Stop'

9PS> }

10PS> Get-CimInstance Win32_LogicalDisk @diskParams |

11PS> Select-Object @{ Name = 'ComputerName'; Expression = {$computer} },

12PS> DeviceID, Size, FreeSpace

13PS> }

14PS> catch {

15PS> [pscustomobject]@{

16PS> ComputerName = $computer

17PS> DeviceID = $null

18PS> Size = $null

19PS> FreeSpace = $null

20PS> Error = $_.Exception.Message

21PS> }

22PS> }

23PS> }