emerge -uvDN world
u = update
v = verbose mode (more info)
D = Deep ,scan the dependencies for updates not just the packages in world list
N = New Use, If new use flags have been set in make.conf or package.use then recompile using them
emerge -uvDN world
u = update
v = verbose mode (more info)
D = Deep ,scan the dependencies for updates not just the packages in world list
N = New Use, If new use flags have been set in make.conf or package.use then recompile using them