BHustus BHustus - 1 year ago 131
PowerShell Question

What exactly does the Resolve-Path cmdlet do?

I've started working with Powershell lately on my Windows 10 system. I've created a profile file, and I wanted to put in a variable which links to a folder in my documents section. However, I didn't want to hard-code the path because I knew I'd need to go in and re-write it if my profile name got changed in a hard drive transfer like it did the last time I sent it in for repairs. So my first thought was to put in something like this:

$Var = $(~\Documents\Folder)

But that spat back an error. Then I learned of the Resolve-Path Cmdlet, which appeared at a glance to be what I needed. However, when I did this:

$Var = $(Resolve-Path ~\Documents\Folder)

... I got this:




Which seemed like a problem. However, when I tried to
cd $Var
, it worked successfully, which confused me greatly. I figured that the extraneous
header in the result would cause an error.

What exactly does
do, and why does it still get interpreted correctly when passed into
? And additionally, is there any way to make
not include the extraneous information and return only the expanded path?

Answer Source

The reason you are seeing the header Path is because Resolve-Path is returning an object of type System.Management.Automation.PathInfo and when this is not captured into a variable it is outputted as a string to the console in a readable format IE:

 ObjProperty1      ObjProperty2      ObjProperty3  ...
 ---------         ---------         ---------     ...
 Value1            Value2            Value3        ...

This object works with cd as PowerShell is smart enough to parse the object ($var) before cd is run. PowerShell will return the value of the path property to cd meaning cd will see a string "C:\Users\Username\Documents\Folder" and not the object headers.

If you want to just return the path without the header use the Select cmdlet's -ExpandProperty parameter:

$var = Resolve-Path '~\Documents\Folder' | select -ExpandProperty Path 

If you would like more information on Resolve-Path MSDN is a good place to start (link).

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