Does using a command line interface help to be a programmer?

Yes, learning a command line helps teach you command syntax, command options, file and directory structure, permissions, regular expressions, and more. So, learning the command line helps you become a programmer or a better programmer than you already may be.

However, how much it helps depends on the type of computer programmer you want to become. To create web pages, server-side scripts (e.g., Perl, PHP (PHP: Hypertext Preprocessor), and Python), or anything on the Internet knowing how to use the Linux command line help a lot. But, to learn programming to make games or other programs it can still help to learn a command line interface, but it may not be as beneficial.

Honestly, learning anything new on the computer is going to help you become more efficient and able to learn faster at anything you hope to achieve.