Linux系统中oracle sqlplus 下edit问题

SP2-0107错误。

SQL> edit
SP2-0107: Nothing to save.
SQL> select * from v$version;

BANNER
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Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production

SQL> define_editor=vi
SQL> edit