This way you'll always have last five logs available, and those too old get deleted. You can also use zip, rar, bzip2 or some other packer to compress the old log files. Since they are plain text, they compress very well.
b) redirect logging to void. For example, on Linux, you can do it by creating a symlink to /dev/null instead of the regular log file:
Please note that you really shouldn't be doing this, as you will lose all valuable diagnostic information. It's better to try to find what are the errors, what's causing them and fix the problem at the source.
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