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For anyone else curious about this strange and seemingly out-of-place command in the upgrade instructions:

# : > /usr/bin/bspatch

See https://www.freebsd.org/security/advisories/FreeBSD-SA-16:29...

> Because this vulnerability exists in bspatch, a component used by freebsd-update, a special procedure must be followed to safely update. First, truncate bspatch to a zero byte file.

> FreeBSD-update will fall back to replacing bspatch, rather than applying a binary patch. Proceed with FreeBSD-update as usual.



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