Basic spec:

function rm($file)
OR
function rm($it)

$file may be an absolute or relative path or a file object. $it may only be a file object.

If $file is a relative path, it's interpreted relative to the current cwd.

If the file to delete is a directory, it behaves like rm -rf in Linux or rm -Recurse -Force in PowerShell. The user must have permissions to delete the relevant files.

If the file to delete is a file, it behaves like rm. The user must have permissions to delete the relevant file.

Open Question: Should rm on a directory confirm? If so, how does it relate to #16.