How to get Command Line info for a process in PowerShell or C#

In PowerShell you can get the command line of a process via WMI:

$process = "notepad.exe"Get-WmiObject Win32_Process -Filter "name = '$process'" | Select-Object CommandLine

Note that you need admin privileges to be able to access that information about processes running in the context of another user. As a normal user it's only visible to you for processes running in your own context.

This answer is excellent, however for futureproofing and to do future you a favor, Unless you're using pretty old powershell (in which case I recommend an update!) Get-WMIObject has been superseded by Get-CimInstance Hey Scripting Guy reference

Try this

$process = "notepad.exe"Get-CimInstance Win32_Process -Filter "name = '$process'" | select CommandLine 

I'm using powershell 7.1 and this seems to be built in to the process object now as a scripted property:

> (Get-Process notepad)[0].CommandLine"C:\WINDOWS\system32\notepad.exe"

Interestingly, you can view its implementation and see that it partially uses the answer from PsychoData:

($process | Get-Member -Name CommandLine).DefinitionSystem.Object CommandLine {get=                        if ($IsWindows) {                            (Get-CimInstance Win32_Process -Filter "ProcessId = $($this.Id)").CommandLine                        } elseif ($IsLinux) {                            Get-Content -LiteralPath "/proc/$($this.Id)/cmdline"                        }                    ;}

Running Get-Member on a process shows that it is an instance of System.Diagnostics.Process, but that it has several properties that are scripted.

The other properties are FileVersion, Path, Product, and ProductVersion.