orapwd

ORAPWD is a utility used to create a password file for an Oracle Database.

Run orapwd utility before:
-setting REMOTE_LOGIN_PASSWORDFILE=EXCLUSIVE or SHARED
-Grant OSDBA/OSOPER to users

Check V$PWFILE_USERS to see who was granted OSDBA/OSOPER access.

Examples :

Create a new password file:
orapwd file=orapwSID password=oracle entries=5

If the password file already exists:
orapwd file=orapwSID password=oracle entries=5 FORCE=Y

The FORCE parameter is available starting from Oracle 10g.