nge the value on-the-fly by editing
     <TT
CLASS="FILENAME"
>postgresql.conf</TT
>, so while the command-line
     method might be convenient, it can cost you flexibility later.
    </P
><P
>     Occasionally it is useful to give a command line option to
     one particular session only. The environment variable
     <TT
CLASS="ENVAR"
>PGOPTIONS</TT
> can be used for this purpose on the
     client side:
</P><PRE
CLASS="PROGRAMLISTING"
>env PGOPTIONS='-c geqo=off' psql</PRE
><P>
     (This works for any <