Mergesort implemented in Ruby. Because of it's performance not really suitable for productive use. (blog entry)

class Array
  def mergesort(&cmp)
    if cmp == nil
      cmp = lambda { |a, b| a <=> b }
    end
    if size <= 1
      self.dup
    else
       halves = split.map{ |half|
        half.mergesort(&cmp)
      }
      merge(*halves, &cmp)
    end
  end

 
  protected
  def split
    n = (length / 2).floor - 1
    [self[0..n], self[n+1..-1]]
  end

  def merge(first, second, &predicate)
    result = []
    until first.empty? || second.empty?
     if predicate.call(first.first, second.first) <= 0
        result << first.shift
      else
        result << second.shift
      end 
    end
    result.concat(first).concat(second)
  end
end

Stable sort method for the Array class. Acts like the original sort method and accepts blocks in the same way. (blog entry)

class Array
  def stable_sort
    n = 0
    c = lambda { |x| n+= 1; [x, n]}
    if block_given?
      sort { |a, b|
        yield(c.call(a), c.call(b))        
      }
    else
      sort_by &c
    end
  end
end

Install CVSup

cd /usr/ports/net/cvsup-without-gui
make install distclean

Make and populate the CVSup config file

touch /root/cvsup-stable-src.sup
echo '*default host=cvsup14.us.FreeBSD.org' >> /root/cvsup-stable-src.sup
echo '*default base=/var/db' >> /root/cvsup-stable-src.sup
echo '*default prefix=/usr' >> /root/cvsup-stable-src.sup
echo '*default release=cvs tag=RELENG_5' >> /root/cvsup-stable-src.sup
echo '*default delete use-rel-suffix compress' >> /root/cvsup-stable-src.sup
echo ' src-all' >> /root/cvsup-stable-src.sup

Update the /usr/src/ tree

cvsup /root/cvsup-stable-src.sup

Get rid of any old "worlds" and make a new one

rm -rf /usr/obj/usr
cd /usr/src/
make buildworld

Make changes to /usr/src/sys/i386/conf/GENERIC and name it was what you want.

Build the kernel, install the kernel, verify it and dot.old in /boot/, run mergemaster, and install the new world.

make buildkernel KERNCONF=GENERIC
make installkernel KERNCONF=GENERIC
mergemaster -p
make installworld
mergemaster
ls -l /boot/
shutdown -r now

Note, we often run in a securelevel of 1 and have immutable binaries in the system folders. You'll need to edit rc.conf.

nano /etc/rc.conf

kern_securelevel_enable="NO"
kern_securelevel="1"

Reboot

shutdown -r now

Then make things mutable

chflags noschg /bin/*
chflags noschg /sbin/*
chflags noschg /bin
chflags noschg /sbin
chflags noschg /usr/bin/*
chflags noschg /usr/sbin/*
chflags noschg /usr/bin
chflags noschg /usr/sbin