How to convert relative path to absolute path in PowerShell?

Question

How to convert relative path to absolute path in PowerShell?

$path1 = C:/1/2/3/
$parth2 = ../../base/
=====
$result = C:/1/base/

Answer 1

(Join-Path $path1 $path2) | Resolve-Path

Answer 2

If your path is not existent yet, most of the above will blow up on you.

Either of the following will work even if the path doesn't exist yet:

[IO.Path]::GetFullPath(".\abc")
$ExecutionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath(".\abc.txt")