Strange problem starting up. Postgres 7.0.

I can get the postmaster to start up manually under Using postgres 7.0 But I cannot get the startup script to start up postgres.

I am running under Yellowdog Linux 1.2. The errors I see are as follows This was clipped from my messages logfile.
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Jun  2 09:54:50 aries PAM_pwdb[12129]: (su) session closed for user postgres
Jun  2 09:54:50 aries logger: -sh: postmaster: command not found
Jun  2 10:01:50 aries PAM_pwdb[12925]: (su) session opened for user postgres by
(uid=0)
Jun  2 10:01:50 aries PAM_pwdb[12925]: (su) session closed for user postgres
Jun  2 10:01:50 aries logger: -sh: postmaster: command not found
Jun  2 10:02:50 aries inetd[796]: pop3/tcp: bind: Address already in use
Jun  2 10:02:52 aries PAM_pwdb[13052]: (su) session opened for user postgres by
(uid=0)
Jun  2 10:02:52 aries PAM_pwdb[13052]: (su) session closed for user postgres
Jun  2 10:02:52 aries logger: -sh: postmaster: command not found
<--------->

Thank in advance.
Eric Naujock