Sysrc is a robust utility for managing rc.conf(5) from the command-line without
a text-editor. Feature-highlights include (but are not limited to):
  - Environment variable taint prevention
  - Shell taint checking (aka boot-regression prevention)
  - File-access race-condition prevention
  - File-structure sensitivity/preservation
  - Intelligent syntax handling
  - Execution performance optimizations
  - Detailed safety measures
  - Support for jails (both legacy and current)

WWW: http://druidbsd.sourceforge.net/