How to clean system

Коньков Евгений kes-kes at
Sat Jan 8 21:29:13 UTC 2011

System have many programs.
Wanna to upgrade to new version of FBSD

Is it possible to clean system from garbage (all programs, files,
header files, except configuration files)
like installing FBSD from CD?

is there cmd?
 make clean-system


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