What is a PowerShell cmdlet?

Question

Approaching cmdlets in a conceptual way,

1. How are they made? Are they compiled?

2. Is it the equivalent of a batch file for PowerShell? Is it a scr

Answer 1

A PowerShell cmdlet is a compiled piece of .NET code, more precisely a single class if I am not mistaken. Cmdlets are kind of the "native" commands in PowerShell land, being able to handle object input and output as well as usually playing nice and well with the (object-based) pipeline.

Cmdlets have no direct representation in the file system, as they are not programs or similar. They exist solely within PowerShell. You can use the Get-Command cmdlet to query all available cmdlets, functions, etc.

You can write cmdlets with a .NET language, such as C#. With PowerShell v2 there is also the possibility to write so-called advanced functions which behave similarly to cmdlets and have comparable capabilities but are interpreted PowerShell code, instead of compiled classes. This may incur a run-time overhead.