How to clean listener trace and log file

Hello,

Oracle 11R2 vanilla. I have following usage for listener data:

diag/tnslsnr/energate-db01/listener

35G    ./trace

71G    ./alert

In trace I have single big listener log file:

-rw-r----- 1 oracle oinstall 36798975743 Oct 24 00:00 listener.log

Under alerts I have 7209 files with pattern log_xxx.xml, starting from  Feb 25 2016.

Can I just manually remove files older than 180 days, using eg:

find diag/tnslsnr/energate-db01/listener/alert -mtime +180 -type f -name '*.xml' -print -delete

Thanks in advance for any tip.