清理listener.log

[root@ ~]# cd
/u01/app/grid/diag/tnslsnr/node2/listener/trace
You have new mail in /var/spool/mail/root
[root@trace]# ls
listener.log
[root@s trace]# ls -lh
total 26G
-rw-r----- 1 grid oinstall 26G Sep 22 15:20 listener.log

[root@ trace]# ls -lh
total 26G
-rw-r----- 1 grid oinstall 26G Sep 22 15:27 listener.log
[root@ trace]# cat /dev/null > listener.log
[root@ trace]# ls -lh
total 32K
-rw-r----- 1 grid oinstall 31K Sep 22 15:27 listener.log