[oracle@localhost bin]$ ./lsnrctl start
LSNRCTL for Linux: Version 12.2.0.1.0 - Production on 17-APR-2018 19:38:32
Copyright (c) 1991, 2016, Oracle. All rights reserved.
Message 1070 not found; No message file for product=network, facility=TNSTNS-12545: Message 12545 not found; No message file for product=network, facility=TNS
TNS-12560: Message 12560 not found; No message file for product=network, facility=TNS
TNS-00515: Message 515 not found; No message file for product=network, facility=TNS
Linux Error: 2: No such file or directory
方法：添加环境变量
ORACLE_HOME=/home/oracle/app/oracle/product/12.2.0/dbhome_2
export ORACLE_HOME