Hello World Prolog
$ cat hello.pl
:- initialization(main).
main :- write('Hello World!'), nl, halt.
$ gplc hello.pl
$ ./hello
Hello World!
middada
$ cat hello.pl
:- initialization(main).
main :- write('Hello World!'), nl, halt.
$ gplc hello.pl
$ ./hello
Hello World!> ./hw
Hello, world!
>