Prerequisites

• Write a descriptive title.
• Make sure you are able to repro it on the latest released version
• Search the existing issues.
• Refer to the FAQ.
• Refer to Differences between Windows PowerShell 5.1 and PowerShell.

Steps to reproduce

Run this on Linux - if you don't have Xvfb then use echoargs or something like that:

~> Xvfb :99

Expected behavior

A headless X server starts up.

Actual behavior

You get an unrecognized option error:

 Xvfb :99
Unrecognized option: /home/mctcbld/:99
use: X [:<display>] [option]

Error details

It seems that PSNativePSPathResolution is transforming :99 to <home-dir>/:99 e.g.:

05-05 08:34:45 12> Trace-Command -Name ParameterBinding -Expression { Xvfb :99 } -PSHost
DEBUG: 2022-05-05 08:35:01.4643 ParameterBinding Information: 0 : BIND NAMED native application line args [/usr/bin/Xvfb]
DEBUG: 2022-05-05 08:35:01.4644 ParameterBinding Information: 0 :     BIND argument [/home/mctcbld/:99]
DEBUG: 2022-05-05 08:35:01.4648 ParameterBinding Information: 0 : CALLING BeginProcessing
Unrecognized option: /home/mctcbld/:99
use: X [:<display>] [option]

Also note that while quoting the arg works Xvfb ':99', it DOES NOT work if you background the process Xvfb ':99' & see the visual below for a screenshot that shows that.

BTW this also repos on the latest 7.3 preview on Windows if you have PSNativePSPathResolution enabled:

05-06 11:24:27 2> echoargs :99
Arg 0 is <C:\Users\Keith\:99>

Command line:
"C:\Users\Keith\Documents\PowerShell\Modules\pscx\4.0.0\Apps\EchoArgs.exe" C:\Users\Keith\:99

Environment data

Name                           Value
----                           -----
PSVersion                      7.2.0
PSEdition                      Core
GitCommitId                    7.2.0
OS                             Linux 3.10.0-229.el7.x86_64 #1 SMP Thu Jan 29 18:37:38 EST 2015
Platform                       Unix
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Visuals