over time, the Listener.log file can grow to huge size and take a lot of disk space.
If you will try to delete it in windows you may get the following error:

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Error Deleting File or Folder
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Cannot delete listener: It is being used by another person or program.

Close any programs that might be using the file and try again.
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OK
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Linux will allow you to delete the file but it will not create a new one.

The solution to this issue is simple. following are some options:

The easiest solution would be to stop the listener process, delete the file and restart the listener service. However, stopping the listener will prevent new connections to the database and disrupt service.

A better option would be to stop logging to the listener.log file:

In the command prompt type >lsnrctl
This will open the Listener control utility. Type LSNRCTL> set log_status off
now you can navigate to the file location and delete the file using the operating system.
This will prevent the file from growing in the futre.
If you like, you can restart logging LSNRCTL> set log_status on
This will allow you to delete listener.log but nothing will be logged when the log_status is set to off.

If you want to the logging to continue. you can switch to a different logging file:
type LSNRCTL> set log_file listener2.log

The listener will now log to the new file. you can delete or move the old file.