title: File permissions on Linux/Unix with .NET Core
body: <p>I am trying to learn how to set file permissions on Linux/Unix with .NET Core.  I already found a question on here that points me in the direction of System.IO.FileSystem, but I can't seem to find any documentation on how to use it.</p>
  <p>In a nutshell, I'd like to chmod a file 644 from a .NET Core application that only runs on Linux, but am at a loss on how to proceed.</p>