port update method

1.install port update tools
#cd /usr/ports/ports-mgmt/portupgrades
#make install clean

2.scan and fix port database
#pkgdb -F

3.update all ports with confirm
#portupgrades -ai

4.update single package and dependence
#portupgrads -R firefox

5.update single port
#portupgrades lsof

6.upgrade packages follow package, port install method
#portupgrades -P gnome2

7.upgrade package force to use package method
#portupgrade -PP gnome2

8.Clean all ports work directory
#portsclean -C

9.delete all packages in /usr/ports/distfiles
#portsclean -D

10.delete all files will not been used
#portsClean -DD