Command name in help output is wrong.

[ronaldborman]

Description

When I run 'npx gatsby --help' (as suggested by https://www.gatsbyjs.org/tutorial/part-zero/) the help text displays the wrong command name:

Usage: gatsby.js [options]

Commands:
gatsby.js develop...

When I then install the cli globally the help text output (with or without the use of npx) changes to:

Usage: index.js [options]

Commands:
index.js develop...

Steps to reproduce

run 'npx gatsby --help'
run 'npm install -g gatsby-cli'
run 'gatsby --help'

Expected result

The help text should contain the command name 'gatsby' (without the extension .js).

Actual result

The help text contains the command name 'gatsby.js' (when npx is used) or 'index.js' (after the global installation of gatsby-cli).

Environment

Node 8.9.4, npm 5.10.0, gatsby 2.4.11.

[yogeshkotadiya]

I can't reproduce this, working as expected.
Same as #5838
I'll take a look into this.

[yogeshkotadiya]

Merged in #12186