This might be a symptom of something else going wrong. The directory contains temporary files that should be deleted after logwatch completes, indicating that it failed on Mar 18, Mar 8, and Sep 13. It's normally run at 4:00 AM, so the one that was still running at 8:11 looks suspicious.

Logwatch provides a very useful summary of important events in the log files. You might want to keep an eye on the directory and try to correlate any failed runs to other activity on your system.

yes its ok.
do this:
cat >/var/cache/logwatch             [enter]



                                                  [press control z] directly.  

done! your logwatch was renew and refresh.                    

I would do:
echo /dev/null>/var/cache/logwatch
This will result in a zero-length file.
You might like to add logwatch to /etc/logrotate.conf, so you don't have to do that again. You can specify to rotate it every interval, or when it gets to some size.
Control-z is not end of file: end of file is Control-d. That will cause  cat in the previous post to exit. The resultant file will be a byte or 2 in length
Control-z will stop a program the shell is running if there is one, else does nothing. If a program was running, you can re-start it with either "bg" (resume execution as a background process) or "fg" (resume as the program bash is running (foreground process)).