How to use slash commands in a function

Hi guys,

I was wondering how could i (if at all possible) to use say a command like:
\! touch fred.txt in a function?
i.e.

CREATE FUNCTION myfunc() RETURNS TRIGGER AS
'BEGIN
\! touch fred.txt
RETURN NEW;
END;'
LANGUAGE 'plpgsql';

At the moment i get:
ERROR: syntax error at or near "\"
Does this mean i should encapsulate the line in quotation marks or something
like that?

Cheers.
Vanessa

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