Problem of installation on Mac

[Lizhe.Xu@xxxxxxxxxxxxxx]

Hi, I am a newbie for pgsql and tried
to install it on my MacBookPro Intel. I got everything correct until creating
the user: postgres and initdb, then the error message showed up for running
the db. How to fix the problem? 

LizheXusComputer:/Users/lizhexu pgsql$
/usr/local/pgsql/bin/postgres -D /usr/local/pgsql/data >logfile 2>&1
&
[1] 17837
LizheXusComputer:/Users/lizhexu pgsql$
su: logfile: Permission denied

[1]+  Exit 1      
           /usr/local/pgsql/bin/postgres
-D /usr/local/pgsql/data >logfile 2>&1
LizheXusComputer:/Users/lizhexu pgsql$
su lizhexu
Password:
LizheXusComputer:~ lizhexu$ /usr/local/pgsql/bin/postgres
-D /usr/local/pgsql/data >logfile 2>&1 &
[1] 17842
LizheXusComputer:~ lizhexu$ /usr/local/pgsql/bin/createdb
test
createdb: could not connect to database
postgres: could not connect to server: No such file or directory
        Is the server
running locally and accepting
        connections
on Unix domain socket "/tmp/.s.PGSQL.5432"?
[1]+  Exit 2      
           /usr/local/pgsql/bin/postgres
-D /usr/local/pgsql/data >logfile 2>&1


Thank you very much.


L