emerge -options

[Jaygo333]

1. I was surfing the forum looking at different emerge options that keep popping up.
Which commands are needed and which are unnecessary.
I can't seem to tell.

emerge -uapvDtN
or
emerge -tva -DNu
or
emerge -uavDN
or

I know there are more out there but don't know which emerge options to use daily.

2. I am Upgrading from 2007.0 to 2008.0 and was wondering the command options used.
Is this the right order too?

First , emerge --sync
Then, emerge portage <--- is this step necessary
Then, One of the commands above.
Then, emerge - e system
Then, emerge -e world

Done upgrading now cleaup so,

First, emerge -av --depclean
Then, revdep-rebuild -- -p -v
Then eclean -dist -df

[AllenJB]

1) You can see details of all the available options and what they do with "emerge --help" and "man emerge"

2) To upgrade from 2007.0 to 2008.0, you need to do the following:
# Update the local copy of the package repository
emerge --sync
# If a new verison of portage is available, update portage now
# Update the profile symlink - the easiest way to do this is with eselect (in the eselect package)
eselect profile list
# Where # is the number of the profile you want to use in the output of profile list
eselect profile set #
# Update all packages where USE flags have changed (which is mostly what changes with profiles)
emerge -uDNva world
# Optional cleanup steps
revdep-rebuild -- -a
emerge --depclean -a
# Whatever else you wish to do

Using emerge -e world or emerge -e system for a profile update is (generally) not necessary and completely pointless.
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[Jaygo333]

[AllenJB]