containing additional category-specific hosts files to include in the amalgamation. Example: `--extensions porn` or
`-e social porn`.
+`--flush-dns-cache`, or `-f`: skip the prompt for flushing the DNS cache. Only active when `--replace` is also active.
+
`--ip nnn.nnn.nnn.nnn`, or `-i nnn.nnn.nnn.nnn`: the IP address to use as the target. Default is `0.0.0.0`.
`--noupdate`, or `-n`: skip fetching updates from hosts data sources.