how to change sys password in Oracle 10g

 To Change the ""SYS"  Password

SQL> conn sys as sysdba
Enter password: (null) no need to give anything
Connected.
SQL> passw system
Changing password for system
New password: (new password)
Retype new password: (new password)
Password changed
SQL> conn system/(new password) 
Connected.
SQL> passw sys
Changing password for sys
New password: (new sys password )
Retype new password: (new sys password )
Password changed
SQL>




any mistake is there or u wanna give any suggestion so please write to me ............