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How to Upgrade FreeBSD 9.0 to 9.1 using freebsd-update

To upgrade Freebsd, we will be using freebsd-update, a great piece of software that fetches and installs binary updates to FreeBSD.

Step 1 : Fetch updates

# freebsd-update fetch
# freebsd-update install

If any updates where installed above – reboot your system before continuing.
Step 2 : Upgrade FreeBSD

# freebsd-update upgrade -r 9.1-RELEASE
# freebsd-update install

The system must now be rebooted with the newly installed kernel before the non-kernel components are updated.

# shutdown -r now

Step 3: Install Update
After rebooting, freebsd-update(8) needs to be run again to install the new userland components:
# freebsd-update install
Step 4: Finally, reboot into 9.1-RELEASE
# reboot

ref: bsdguides.org

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