system() commands

Hi,
I have been using perl to launch Prolog via the system("swipl"); command. This has worked fine so far. However, when I try to issue commands to Prolog via Perl to read in files and perform queries etc such as
system("consult(roy_uk).");

I get errors such as:
sh: -c: line 1: syntax error near unexpected token `roy_uk'
sh: -c: line 1: `consult(roy_uk)'

Ive only been teaching myself Perl for the last few weeks so I'm not sure if I am even going about this is the correct way, but any help would be much appreciated!!

thanks.
.

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