copying table to a file

Hi,
I am attempting to copy the contents of a table to a file, like this:

foodserver=> COPY company TO '/home/peter/copytest.out';

But I keep getting this error:

ERROR: COPY command, running in backend with effective uid 100, could not
open file '/home/peter/copytest.out' for writing. Errno = Permission
denied (13).

Does anybody know how I can fix this so I have permission to open files?

Thanks,

Tyler Wood
twood(at)uwm(dot)edu