Equivalent of *Nix 'which' command in PowerShell?

Question

How do I ask PowerShell where something is?

For instance, \"which notepad\" and it returns the directory where the notepad.exe is run from according to the current

Answer 1

A quick-and-dirty match to Unix which is

New-Alias which where.exe

But it returns multiple lines if they exist so then it becomes

function which {where.exe command | select -first 1}