Например в man transmission-daemon есть строки:
OPTIONS
-a --allowed x.x.x.x,...
Allow RPC access to a comma-delimited whitelist of IP addresses. Wildcards can be specified in an address by using '*'. Default: "127.0.0.1"
Example: "127.0.0.*,192.168.1.*"
-b --blocklist
Enable peer blocklists. Transmission understands the bluetack blocklist file format. New blocklists can be added by copying them into the con‐
fig-dir's "blocklists" subdirectory.
-c directory
Directory to watch for new .torrent files to be added. As they are added to this directory, the daemon will load them into Transmission.
Что они означают?