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Problem: In a FreeBSD port, it is needed to allow to start tor with user _tor. Currently, the package has to append _"User tor" during startup to the etc/tor/torrc that is generally edited by the user.

While this works, automated updating etc/tor/torrc is ugly. It is ugly because it makes torrc different from the original @sample file, and because it is an error-prone process. User might delete/modify this line.

Proposed solution: Add --torrc-values {|-separated torrc values}. This argument will be parsed and will initialize values that are normally set in the torrc file. The process' user (in my case the startup script) will supply _--torrc-values "User tor" which will nicely take effect in addition to what the user set in the torrc file.