Execute commands in single-user mode

Hi all.
 
I'm planning to move all my pg_largeobject tables to separate tablespaces and
to be able to do that I need to shuddown PG and start in single-user mode, like
this:
 
postgres --single -O -D $PGDATA $DB_NAME
 
Then I have to execute the command:
alter table pg_largeobject set tablespace some_tablespace;
 
Is it possible to issue the above ALTER-statement from the command-line so I
can start PG in single-user mode AND execute the ALTER-statement from the
command-line i a bash-loop?
 
Thanks.
 
-- Andreas Joseph Krogh
CTO / Partner - Visena AS
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