Had to learn this lesson the hard way yesterday. I was working on a script that uses relative paths to the folder where the script is.

I want to use the script from a jenkins Job. The job executed the script from different folder than the scripts own folder and suddenly none of the relative paths where found.

Checkout this script doSource.ps1:

#The Path asscociated with the . changes when you run it from another folder
Resolve-Path . 
#Script Root doesn't change
Resolve-Path $PSScriptRoot

And what happens when i run it:

PS F:\data\ps-scripts> .\doSource.ps1

Path
----
F:\data\ps-scripts

F:\data\ps-scripts

PS F:\data\ps-scripts> cd..
PS F:\data> .\ps-scripts\doSource.ps1

Path
----
F:\data

F:\data\ps-scripts

So, if your are using relative paths in your script $PSScriptRoot is your friend.