SP2-0734: unknown command beginning "lsnrctl st..." - rest of line ignored.
Cause（原因）:
Command was being entered as an SQL command.
在SQL命令窗口输入命令。
Resolution（解决方法）:
Perform the command from the unix command line as the oracle user, that is, do "sudo su - oracle" or "su - oracle" and enter the command. Do *not* do sqlplus or "s+".
在linux操作系统oracle用户或者root输入lsnrctl start。
链接地址：https://knowledge.exlibrisgroup.com/Aleph/Knowledge_Articles/lsnrctl%3A_%22unknown_command_beginning_%22lsnrctl_st...%22_-_rest_of_line_ignored.