Run prolog from command prompt,get input from file and send output to a file

Question

I want to run swipl prolog through command prompt,I want to read input.txt as a query file and want to output result to output.txt

My command line command:

swipl -f asd.pl < input.txt > output.txt

But my output result is comming on command prompt and getting blank output.txt file.

Answer 1

It's working right for me. Are you sure you are not receiving errors on command prompt ? Note: to output stderr you should use 2> filename

Example (test.pl):

:- initialization(main).

main:-
  repeat,
    read(Term),
     writeln(term(Term)),
    Term=end_of_file -> halt, fail.


swipl.exe -f test.pl < test.pl > test.txt  2> stderr.txt

writes on test.txt:

term((:-initialization main))
term((main:-repeat,read(_G747),writeln(term(_G747)),_G747=end_of_file->halt,fail))
term(end_of_file)

and on stderr.txt:

% c:/swi/workspace/test.pl compiled 0.00 sec, 4 clauses