.SH "SYNOPSIS"
.TP
.BR emerge
-[\fIoptions\fR] [\fIaction\fR] [\fIebuild\fR | \fItbz2file\fR | \fIclass\fR | \fIdependency\fR] ...
+[\fIoptions\fR] [\fIaction\fR] [\fIebuild\fR | \fItbz2file\fR | \fIset\fR | \fIdependency\fR] ...
.TP
.BR emerge
\fB\-\-sync\fR | \fB\-\-info\fR | \fB\-\-version\fR
installed packages to newer releases as well. It handles both source
and binary packages, and it can be used to create binary packages for
distribution.
-.SH "EBUILDS, TBZ2S, CLASSES AND DEPENDENCIES"
+.SH "EBUILDS, TBZ2S, SETS AND DEPENDENCIES"
\fBemerge\fR primarily installs packages. You can specify
packages to install in one of four main ways: an \fIebuild\fR,
-a \fItbz2file\fR, a \fIclass\fR, or a \fIdependency\fR.
+a \fItbz2file\fR, a \fIset\fR, or a \fIdependency\fR.
.LP
.TP
.BR ebuild
<package>\-<version>.ebuild package\fR or \fBemerge \-\-buildpkg
[category/]<package>\fR or \fBquickpkg /var/db/pkg/<category>/<package>\fR.
.TP
-.BR class
-Package classes are a convenient shorthand for large groups of
-packages. Two classes are currently supported: \fBsystem\fR
+.BR set
+Package sets are a convenient shorthand for large groups of
+packages. Two sets are currently supported: \fBsystem\fR
and \fBworld\fR. \fBsystem\fR refers to a set of packages
deemed necessary for your system to run properly. \fBworld\fR
contains all of the packages in \fBsystem\fR, along with any
.BR "No action"
If no action is specified, the action is to merge in the specified
packages, satisfying any dependencies that they may have. The
-arguments can be \fIebuilds\fR, \fItbz2s\fR, \fIclasses\fR, or
+arguments can be \fIebuilds\fR, \fItbz2s\fR, \fIsets\fR, or
\fIdependencies\fR. \fBNote that you need to use the \-\-usepkg
option if you want to install a tbz2\fR. The packages are added
to the \fBworld\fR file at the end, so that they are considered for
.BR "\-\-clean " (\fB\-c\fR)
Cleans the system by removing packages that will not affect the
functionality of the system. The arguments can be \fIebuilds\fR,
-\fIclasses\fR, or \fIdependencies\fR. For example, \fBemerge
+\fIsets\fR, or \fIdependencies\fR. For example, \fBemerge
clean binutils\fR cleans out old versions of binutils;
\fBemerge \-\-clean net\-www/mozilla\-0.9.9\-r2\fR cleans out that
specific version of Mozilla. This is generally safe to use.
check dependencies, so it may also remove packages necessary for the proper
operation of your system. \fBUse\fR \-\-clean \fBinstead unless you really
know what you're doing\fR. Its arguments can be \fIebuilds\fR,
-\fIclasses\fR, or \fIdependencies\fR \-\- see \fB\-\-clean\fR above for
+\fIsets\fR, or \fIdependencies\fR \-\- see \fB\-\-clean\fR above for
examples. You have been warned!
.TP
.BR \-\-regen
\fBWARNING: This action can remove important packages!\fR Removes
all matching packages. This does no checking of dependencies, so
it may remove packages necessary for the proper operation of your
-system. Its arguments can be \fIebuilds\fR, \fIclasses\fR, or
+system. Its arguments can be \fIebuilds\fR, \fIsets\fR, or
\fIdependencies\fR \-\- see \fB\-\-clean\fR above for examples.
.TP
.BR "\-\-update " (\fB\-u\fR)
You should almost always precede any package install or update attempt with a
\fB\-\-pretend\fR install or update. This lets you see how much will be
done, and shows you any blocking packages that you will have to rectify.
-This goes doubly so for the \fBsystem\fR and \fBworld\fR classes, which can
+This goes doubly so for the \fBsystem\fR and \fBworld\fR sets, which can
update a large number of packages if the portage tree has been particularly
active.
.LP
\fB/var/lib/portage/world\fR
Contains a list of all user\-specified packages. You can safely edit
this file, adding packages that you want to be considered in \fBworld\fR
-class updates and removing those that you do not want to be considered.
+set updates and removing those that you do not want to be considered.
.TP
\fB/etc/make.conf\fR
Contains variables for the build process, overriding those in
.TP
\fB/etc/make.profile/packages\fR
Contains a list of packages used for the base system. The \fBsystem\fR
-and \fBworld\fR classes consult this file. \fBDo not edit this file\fR.
+and \fBworld\fR sets consult this file. \fBDo not edit this file\fR.
.TP
\fB/etc/make.globals\fR
Contains the default variables for the build process. \fBDo not edit