linux环境下查看日志的最后几行可以使用 tail 命令：

[oracle@gl admin]$ tail -20 /data/diag/tnslsnr/gl/listener/alert/log.xml
 type='UNKNOWN' level='16' host_id='gl.localdomain'
 host_addr='192.168.222.133'>
 Started with pid=9385
 

 type='UNKNOWN' level='16' host_id='gl.localdomain'
 host_addr='192.168.222.133'>
 Error listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=gl.localdomain)(PORT=1521)))
 

 type='UNKNOWN' level='16' host_id='gl.localdomain'
 host_addr='192.168.222.133'>
 TNS-12560: TNS:protocol adapter error
 TNS-00583: Valid node checking: unable to parse configuration parameters