You call it a script when you want to highlight the interaction with the environment (the OS for bash, the DOM/browser for JS), you call it a program when you w

You call it a script when you want to highlight the interaction with the environment (the OS for bash, the DOM/browser for JS), you call it a program when you want to highlight its uses in the applicative domain (node runs JS, imagemagik converts images). Every program is a script for its evironment and every script is a program for its desired effect.