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

Question

How can I access command line arguments in Nim?

The documentation shows only how to run the compiled Nim code with command line arguments

nim compile --run greetings.nim arg1 arg2

but I didn't find how to use their values in code.

Answer 1

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

import os

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

Answer 2

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).