sqlplus 中文显示为问号

[oracle@ocp01 ~]$ echo $LANG
zh_CN.UTF-8

SQL> select userenv('language') from dual;
USERENV('LANGUAGE')
SIMPLIFIED CHINESE_CHINA.AL32UTF8

设置NLS_LANG

[oracle@ocp01 ~]$ grep -i nls ~/.bash_profile 
NLS_LANG="SIMPLIFIED CHINESE_CHINA.AL32UTF8"
export ORACLE_BASE ORACLE_HOME ORACLE_SID NLS_LANG PATH