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<chapter><title>Quick Start</title>
<para>This chapter is for impatient people who don't like reading
documentation. For more in-depth information you are kindly referred
to <xref linkend='chap-installation' /> and <xref
linkend='chap-overview' />.</para>
<orderedlist>
<listitem><para>Download a source tarball or RPM from <ulink
url='http://www.cs.uu.nl/groups/ST/Trace/Nix'/>. Build source
distributions using the regular sequence:
<screen>
$ tar xvfj nix-<replaceable>version</replaceable>.tar.bz2
$ ./configure
$ make
$ make install <lineannotation>(as root)</lineannotation></screen>
This will install Nix in <filename>/nix</filename>. You shouldn't
change the prefix if at all possible since that will make it
impossible to use our pre-built components. Alternatively, you could
grab an RPM if you're on an RPM-based system. You should also add
<filename>/nix/etc/profile.d/nix.sh</filename> to your
<filename>~/.bashrc</filename> (or some other login
file).</para></listitem>
<listitem><para>Subscribe to the Nix Packages channel.
<screen>
$ nix-channel --add http://catamaran.labs.cs.uu.nl/dist/nix/channels/nixpkgs-unstable</screen>
</para></listitem>
<listitem><para>Download the latest Nix expressions available in the channel.
<screen>
$ nix-channel --update</screen>
Note that this in itself doesn't download any components, it just
downloads the Nix expressions that build them and stores them
somewhere (under <filename>~/.nix-defexpr</filename>, in case you're
curious). Also, it registers the fact that pre-built binaries are
available remotely.</para></listitem>
<listitem><para>See what installable components are currently
available in the channel:
<screen>
$ nix-env -qa
docbook-xml-4.2
firefox-1.0pre-PR-0.10.1
hello-2.1.1
libxslt-1.1.0
<replaceable>...</replaceable></screen>
</para></listitem>
<listitem><para>Install some components from the channel:
<screen>
$ nix-env -i hello firefox <replaceable>...</replaceable> </screen>
This should download the pre-built components; it should not build
them locally (if it does, something went wrong).</para></listitem>
<listitem><para>Test that they work:
<screen>
$ which hello
/home/eelco/.nix-profile/bin/hello
$ hello
Hello, world!
$ firefox
<lineannotation>(read Slashdot or something)</lineannotation></screen>
</para></listitem>
<listitem><para>Uninstall a package:
<screen>
$ nix-env -e hello</screen>
</para></listitem>
<listitem><para>To keep up-to-date with the channel, do:
<screen>
$ nix-channel --update
$ nix-env -u '*'</screen>
The latter command will upgrade each installed component for which
there is a <quote>newer</quote> version (as determined by comparing
the version numbers).</para></listitem>
<listitem><para>If you're unhappy with the result of a
<command>nix-env</command> action (e.g., an upgraded component turned
out not to work properly), you can go back:
<screen>
$ nix-env --rollback</screen>
</para></listitem>
<listitem><para>You should periodically run the Nix garbage collector
to get rid of unused packages, since uninstalls or upgrades don't
actual delete them:
<screen>
$ nix-env --delete-generations old
$ nix-collect-garbage</screen>
The first command deletes old <quote>generations</quote> of your
profile (making rollbacks impossible, but also making the components
in those old generations available for garbage collection), while the
second command actually deletes them.</para></listitem>
</orderedlist>
</chapter>
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