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<refentry>
<refnamediv>
<refname>nix-instantiate</refname>
<refpurpose>instantiate store expressions from Nix expressions</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>nix-instantiate</command>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="opt-common-syn.xml#xpointer(/nop/*)" />
<group choice='opt'>
<arg choice='plain'><option>--parse-only</option></arg>
<arg choice='plain'><option>--eval-only</option></arg>
</group>
<arg choice='plain' rep='repeat'><replaceable>files</replaceable></arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsection>
<title>Description</title>
<para>
The command <command>nix-instantiate</command> generates
(low-level) store expressions from (high-level) Nix expressions.
It loads and evaluates the Nix expressions in each of
<replaceable>files</replaceable>. Each top-level expression
should evaluate to a derivation, a list of derivations, or a set
of derivations. The paths of the resulting store expressions
are printed on standard output.
</para>
<para>
This command is generally used for testing Nix expression before
they are used with <command>nix-env</command>. See also <xref
linkend="sec-common-options" />.
</para>
</refsection>
<refsection>
<title>Options</title>
<variablelist>
<varlistentry>
<term><option>--parse-only</option></term>
<listitem>
<para>
Just parse the input files, and print their abstract
syntax trees on standard output in ATerm format.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--eval-only</option></term>
<listitem>
<para>
Just parse and evaluate the input files, and print the
resulting values on standard output. No instantiation of
store expressions takes place.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Examples</title>
<screen>
$ nix-instantiate gcc.nix <lineannotation>(instantiate)</lineannotation>
/nix/store/468abdcb93aa22bb721142615b97698b-d-gcc-3.3.2.store
$ nix-store -r $(nix-instantiate gcc.nix) <lineannotation>(build)</lineannotation>
$ nix-store -r $(nix-instantiate gcc.nix) <lineannotation>(print output path)</lineannotation>
/nix/store/9afa718cddfdfe94b5b9303d0430ceb1-gcc-3.3.2
$ ls -l /nix/store/9afa718cddfdfe94b5b9303d0430ceb1-gcc-3.3.2
dr-xr-xr-x 2 eelco users 360 2003-12-01 16:12 bin
dr-xr-xr-x 3 eelco users 72 2003-12-01 16:12 include
...</screen>
</refsection>
</refentry>
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