making "sqlplus /" work

hi,

i want to make "sqlplus /" connect directly into the db without giving "invalid username/password" or prompting for username and password.

what do i need to to do in order to achieve this?

i have a unix user scott. i have a db user scott.

i have these relevant oracle db parameters:
*.remote_os_authent=TRUE
*.os_authent_prefix=' '

logged in as unix user scott, i want to issue "sqlplus /" and connect directly into the db.

logged into unix user scott:
sqlplus scott/tiger -> works OK
sqlplus scott -> prompts for password
sqlplus -> prompts for username & password sqlplus /.-> gives ERROR:ORA-01017: invalid username/password; logon denied

what am i missing here?

--
reply to group, email invalid