Joao Miguel Ferreira <[EMAIL PROTECTED]> writes:
> This is what I do:
> system("su postgres -c \"pg_dumpall --clean > some_file\"");

This is going to try to find pg_dumpall in whatever PATH is currently
active within the script --- maybe there's something bogus about that
path?  Personally I'd use "su - postgres".

                        regards, tom lane

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