The task is to programmatically obtain the name used to invoke the program. (For example determine whether the user ran "python hello.py", or "python hellocaller.py", a program importing the code from "hello.py".)

Sometimes a multiline shebang is necessary in order to provide the script name to a language's internal ARGV.

See also Command-line arguments

Examples from GitHub.

#!/usr/bin/env io
 
main := method(
	program := System args at(0)
 
	("Program: " .. program) println
)
 
if (System args size > 0 and System args at(0) containsSeq("scriptname"), main)