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.

program ProgramName;
 
{$APPTYPE CONSOLE}
 
begin
  Writeln('Program name: ' + ParamStr(0));
  Writeln('Command line: ' + CmdLine);
end.