This assumes you have installed OpenResty on a Linux system.

The resty command line tool can be used to issue in line commands, like this.

~]# resty -e 'print("Hello World")'
Hello World

Another approach is to create a resty script. Let's say foo.resty contains the following.

#!/bin/resty
print("Hello World")

Invoking this script should return Hello World.

~]# resty foo.resty
Hello World