package operation in Gentoo

search software with keyword:
Gentoo: emerge -s
Debian: apt-cache search
FreeBSD: make search name= 或
ports_glob -- need portupgrade

Install software:
Gentoo: emerge
Debian: apt-get install
FreeBSD: portinstall


remove package:
Gentoo: emerge unmerge
Debian: apt-get remove
FreeBSD: pkg_deinstall


Update single package:
Gentoo: emerge -u
Debian: ?
FreeBSD: portupgrade


check what packages will be impacted by updating all installed packages:
Gentoo: emerge -puDv world
Debian: apt-get -u dist-upgrade
FreeBSD: portupgrade -arnv

update the system:
Gentoo: emerge -u --deep world
Debian: apt-get dist-upgrade
FreeBSD: make world ; portupgrade -ar


query installed packages:
Gentoo: emerge -pe world 或 qpkg -I -v
Debian: dpkg --get-selections
FreeBSD: pkg_info

check the dependency of package:
Gentoo: qpkg -f
(need gentoolkit)
Debian: dpkg -S
FreeBSD: pkg_info -W

check the components of a package:
Gentoo: qpkg -l
Debian: ?
FreeBSD: pkg_info -L

check the components of a package with keyword
Gentoo: qpkg -I | grep (qpkg -v to check version)
Debian:
FreeBSD: pkg_info | grep

query the introduction to package with keyword
Gentoo: emerge -S
Debian: ?
FreeBSD: make search key=

remove package without dependency:
Gentoo: emerge -C
Debian:
FreeBSD: pkg_delete -f

rebuild the system:
Gentoo: emerge -e world
Debian: ?
FreeBSD: make world ; portupgrade -arf