emerge --help
This is the output of emerge --help
emerge (manual) is a Gentoo Linux package management tool.
emerge: the other white meat (command-line interface to the Portage system)
Usage:
emerge [ options ] [ action ] [ ebuildfile | tbz2file | dependency ] [ ... ]
emerge [ options ] [ action ] < system | world >
emerge < --sync | --metadata | --info >
emerge --resume [ --pretend | --ask | --skipfirst ]
emerge --help [ system | world | --sync ]
Options: -[abBcCdDefgGhkKlnNoOpqPsStuvV] [--oneshot] [--newuse] [--noconfmem]
[ --color < y | n > ] [ --columns ]
[ --reinstall changed-use ] [--nospinner]
[ --deep ] [--with-bdeps < y | n > ]
Actions: [ --clean | --depclean | --prune | --regen | --search | --unmerge ]
For more help try 'emerge --help --verbose' or consult the man page.