How to get access to command-line arguments in Nim?

Personally I find paramCount and paramStr a bit confusing to work with, because the paramCount value differs from C conventions (see the document links).

Fortunately, there are additional convenient functions which do not require to be aware of the conventions:

• commandLineParams returns a seq of only command line params.
• getAppFilename returns the executable file name (what is argv[0] in the C world).

Here's an example that prints the number of arguments and the first argument:

import os

echo paramCount(), " ", paramStr(1)