连到本地数据库，为什么还报这个错误

登录本地数据库，为什么总是出现这个错误呢？

db2 connect to lddb

   Database Connection Information

Database server        = DB2/LINUXX8664 10.5.6

SQL authorization ID   = DB2INST1

Local database alias   = LDDB

$ db2 listdbdirectory

DB21034E  The command was processed as an SQL statement because it was not a

valid Command Line Processor command.  During SQL processing it returned:

SQL0104N  An unexpected token "END-OF-STATEMENT" was found following

"listdbdirectory".  Expected tokens may include:  "JOIN ".  

SQLSTATE=42601