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</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-edit/" class="md-nav__link">
<span class="md-ellipsis">
nix edit
</span>
</a>
</li>
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<a href="../nix3-eval/" class="md-nav__link">
<span class="md-ellipsis">
nix eval
</span>
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<a href="../nix3-flake-archive/" class="md-nav__link">
<span class="md-ellipsis">
nix flake archive
</span>
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</li>
<li class="md-nav__item">
<a href="../nix3-flake-check/" class="md-nav__link">
<span class="md-ellipsis">
nix flake check
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-flake-clone/" class="md-nav__link">
<span class="md-ellipsis">
nix flake clone
</span>
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<li class="md-nav__item">
<a href="../nix3-flake-info/" class="md-nav__link">
<span class="md-ellipsis">
nix flake info
</span>
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</li>
<li class="md-nav__item">
<a href="../nix3-flake-init/" class="md-nav__link">
<span class="md-ellipsis">
nix flake init
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-flake-lock/" class="md-nav__link">
<span class="md-ellipsis">
nix flake lock
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-flake-metadata/" class="md-nav__link">
<span class="md-ellipsis">
nix flake metadata
</span>
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</li>
<li class="md-nav__item">
<a href="../nix3-flake-new/" class="md-nav__link">
<span class="md-ellipsis">
nix flake new
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-flake-prefetch/" class="md-nav__link">
<span class="md-ellipsis">
nix flake prefetch
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-flake-show/" class="md-nav__link">
<span class="md-ellipsis">
nix flake show
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-flake-update/" class="md-nav__link">
<span class="md-ellipsis">
nix flake update
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-flake/" class="md-nav__link">
<span class="md-ellipsis">
nix flake
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-fmt/" class="md-nav__link">
<span class="md-ellipsis">
nix fmt
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-hash-file/" class="md-nav__link">
<span class="md-ellipsis">
nix hash file
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-hash-path/" class="md-nav__link">
<span class="md-ellipsis">
nix hash path
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-hash-to-base16/" class="md-nav__link">
<span class="md-ellipsis">
nix hash to-base16
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-hash-to-base32/" class="md-nav__link">
<span class="md-ellipsis">
nix hash to-base32
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-hash-to-base64/" class="md-nav__link">
<span class="md-ellipsis">
nix hash to-base64
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-hash-to-sri/" class="md-nav__link">
<span class="md-ellipsis">
nix hash to-sri
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-hash/" class="md-nav__link">
<span class="md-ellipsis">
nix hash
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-help-stores/" class="md-nav__link">
<span class="md-ellipsis">
nix help-stores
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-help/" class="md-nav__link">
<span class="md-ellipsis">
nix help
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-key-convert-secret-to-public/" class="md-nav__link">
<span class="md-ellipsis">
nix key convert-secret-to-public
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-key-generate-secret/" class="md-nav__link">
<span class="md-ellipsis">
nix key generate-secret
</span>
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</li>
<li class="md-nav__item">
<a href="../nix3-key/" class="md-nav__link">
<span class="md-ellipsis">
nix key
</span>
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<a href="../nix3-log/" class="md-nav__link">
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nix log
</span>
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<a href="../nix3-nar-cat/" class="md-nav__link">
<span class="md-ellipsis">
nix nar cat
</span>
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</li>
<li class="md-nav__item">
<a href="../nix3-nar-dump-path/" class="md-nav__link">
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nix nar dump-path
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<a href="../nix3-nar-ls/" class="md-nav__link">
<span class="md-ellipsis">
nix nar ls
</span>
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<li class="md-nav__item">
<a href="../nix3-nar/" class="md-nav__link">
<span class="md-ellipsis">
nix nar
</span>
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<a href="../nix3-path-info/" class="md-nav__link">
<span class="md-ellipsis">
nix path-info
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<a href="../nix3-print-dev-env/" class="md-nav__link">
<span class="md-ellipsis">
nix print-dev-env
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<li class="md-nav__item">
<a href="../nix3-profile-diff-closures/" class="md-nav__link">
<span class="md-ellipsis">
nix profile diff-closures
</span>
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</li>
<li class="md-nav__item">
<a href="../nix3-profile-history/" class="md-nav__link">
<span class="md-ellipsis">
nix profile history
</span>
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</li>
<li class="md-nav__item">
<a href="../nix3-profile-install/" class="md-nav__link">
<span class="md-ellipsis">
nix profile install
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-profile-list/" class="md-nav__link">
<span class="md-ellipsis">
nix profile list
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-profile-remove/" class="md-nav__link">
<span class="md-ellipsis">
nix profile remove
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-profile-rollback/" class="md-nav__link">
<span class="md-ellipsis">
nix profile rollback
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-profile-upgrade/" class="md-nav__link">
<span class="md-ellipsis">
nix profile upgrade
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-profile-wipe-history/" class="md-nav__link">
<span class="md-ellipsis">
nix profile wipe-history
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<a href="../nix3-profile/" class="md-nav__link">
<span class="md-ellipsis">
nix profile
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<a href="../nix3-realisation-info/" class="md-nav__link">
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nix realisation info
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<a href="../nix3-realisation/" class="md-nav__link">
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nix realisation
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<a href="../nix3-registry-add/" class="md-nav__link">
<span class="md-ellipsis">
nix registry add
</span>
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<a href="../nix3-registry-list/" class="md-nav__link">
<span class="md-ellipsis">
nix registry list
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<a href="../nix3-registry-pin/" class="md-nav__link">
<span class="md-ellipsis">
nix registry pin
</span>
</a>
</li>
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<a href="../nix3-registry-remove/" class="md-nav__link">
<span class="md-ellipsis">
nix registry remove
</span>
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<a href="../nix3-registry/" class="md-nav__link">
<span class="md-ellipsis">
nix registry
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nix repl
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nix run
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nix search
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nix shell
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nix store add-file
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nix store add-path
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nix store cat
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nix store copy-log
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nix store copy-sigs
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nix store delete
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nix store diff-closures
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nix store dump-path
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nix store gc
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nix store make-content-addressed
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nix store make-content-addressed
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nix store ping
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nix store prefetch-file
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nix store repair
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nix store sign
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nix store verify
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nix store
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nix upgrade-nix
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<h1 id="nix-store-make-content-addressed"><code>nix store make-content-addressed</code></h1>
<p>Rewrite a path or closure to content-addressed form.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
</div>
<blockquote>
<p>This program is
<a href="../../../contributing/experimental-features/#xp-feature-nix-command"><strong>experimental</strong></a>
and its interface is subject to change.</p>
</blockquote>
<h2 id="synopsis">Synopsis</h2>
<p><code>nix store make-content-addressed</code> [<em>option</em>...] <em>installables</em>...</p>
<h2 id="examples">Examples</h2>
<ul>
<li>Create a content-addressed representation of the closure of GNU Hello:</li>
</ul>
<div class="highlight"><pre><span></span><code><span class="gp">#</span><span class="c1"># nix store make-content-addressed nixpkgs#hello</span>
<span class="go">…</span>
<span class="go">rewrote &#39;/nix/store/v5sv61sszx301i0x6xysaqzla09nksnd-hello-2.10&#39; to &#39;/nix/store/5skmmcb9svys5lj3kbsrjg7vf2irid63-hello-2.10&#39;</span>
</code></pre></div>
<p>Since the resulting paths are content-addressed, they are always
trusted and don't need signatures to copied to another store:</p>
<div class="highlight"><pre><span></span><code><span class="gp">#</span><span class="c1"># nix copy --to /tmp/nix --trusted-public-keys &#39;&#39; /nix/store/5skmmcb9svys5lj3kbsrjg7vf2irid63-hello-2.10</span>
</code></pre></div>
<p>By contrast, the original closure is input-addressed, so it does
need signatures to be trusted:</p>
<div class="highlight"><pre><span></span><code><span class="gp">#</span><span class="c1"># nix copy --to /tmp/nix --trusted-public-keys &#39;&#39; nixpkgs#hello</span>
<span class="go">cannot add path &#39;/nix/store/zy9wbxwcygrwnh8n2w9qbbcr6zk87m26-libunistring-0.9.10&#39; because it lacks a signature by a trusted key</span>
</code></pre></div>
<ul>
<li>Create a content-addressed representation of the current NixOS
system closure:</li>
</ul>
<div class="highlight"><pre><span></span><code><span class="gp">#</span><span class="c1"># nix store make-content-addressed /run/current-system</span>
</code></pre></div>
<h2 id="description">Description</h2>
<p>This command converts the closure of the store paths specified by
<a href="../nix/#installables"><em>installables</em></a> to content-addressed form.</p>
<p>Nix store paths are usually
<em>input-addressed</em>, meaning that the hash part of the store path is
computed from the contents of the derivation (i.e., the build-time
dependency graph). Input-addressed paths need to be signed by a
trusted key if you want to import them into a store, because we need
to trust that the contents of the path were actually built by the
derivation.</p>
<p>By contrast, in a <em>content-addressed</em> path, the hash part is computed
from the contents of the path. This allows the contents of the path to
be verified without any additional information such as
signatures. This means that a command like</p>
<div class="highlight"><pre><span></span><code><span class="gp">#</span><span class="c1"># nix store build /nix/store/5skmmcb9svys5lj3kbsrjg7vf2irid63-hello-2.10 </span>
<span class="go"> --substituters https://my-cache.example.org</span>
</code></pre></div>
<p>will succeed even if the binary cache <code>https://my-cache.example.org</code>
doesn't present any signatures.</p>
<h2 id="options">Options</h2>
<ul>
<li>
<p><span id="opt-from"><a href="#opt-from"><code>--from</code></a></span> <em>store-uri</em>
URL of the source Nix store.</p>
</li>
<li>
<p><span id="opt-json"><a href="#opt-json"><code>--json</code></a></span>
Produce output in JSON format, suitable for consumption by another program.</p>
</li>
<li>
<p><span id="opt-stdin"><a href="#opt-stdin"><code>--stdin</code></a></span>
Read installables from the standard input. No default installable applied.</p>
</li>
<li>
<p><span id="opt-to"><a href="#opt-to"><code>--to</code></a></span> <em>store-uri</em>
URL of the destination Nix store.</p>
</li>
</ul>
<p><strong>Common evaluation options:</strong></p>
<ul>
<li>
<p><span id="opt-arg"><a href="#opt-arg"><code>--arg</code></a></span> <em>name</em> <em>expr</em>
Pass the value <em>expr</em> as the argument <em>name</em> to Nix functions.</p>
</li>
<li>
<p><span id="opt-argstr"><a href="#opt-argstr"><code>--argstr</code></a></span> <em>name</em> <em>string</em>
Pass the string <em>string</em> as the argument <em>name</em> to Nix functions.</p>
</li>
<li>
<p><span id="opt-debugger"><a href="#opt-debugger"><code>--debugger</code></a></span>
Start an interactive environment if evaluation fails.</p>
</li>
<li>
<p><span id="opt-eval-store"><a href="#opt-eval-store"><code>--eval-store</code></a></span> <em>store-url</em>
The <a href="../nix3-help-stores/#store-url-format">URL of the Nix store</a>
to use for evaluation, i.e. to store derivations (<code>.drv</code> files) and inputs referenced by them.</p>
</li>
<li>
<p><span id="opt-impure"><a href="#opt-impure"><code>--impure</code></a></span>
Allow access to mutable paths and repositories.</p>
</li>
<li>
<p><span id="opt-include"><a href="#opt-include"><code>--include</code></a></span> / <code>-I</code> <em>path</em>
Add <em>path</em> to the Nix search path. The Nix search path is
initialized from the colon-separated <a href="../../env-common/#env-NIX_PATH"><code>NIX_PATH</code></a> environment
variable, and is used to look up the location of Nix expressions using <a href="../../../language/values/#type-path">paths</a> enclosed in angle
brackets (i.e., <code>&lt;nixpkgs&gt;</code>).</p>
</li>
</ul>
<p>For instance, passing</p>
<div class="highlight"><pre><span></span><code>-I /home/eelco/Dev
-I /etc/nixos
</code></pre></div>
<p>will cause Lix to look for paths relative to <code>/home/eelco/Dev</code> and
<code>/etc/nixos</code>, in that order. This is equivalent to setting the
<code>NIX_PATH</code> environment variable to</p>
<div class="highlight"><pre><span></span><code>/home/eelco/Dev:/etc/nixos
</code></pre></div>
<p>It is also possible to match paths against a prefix. For example,
passing</p>
<div class="highlight"><pre><span></span><code>-I nixpkgs=/home/eelco/Dev/nixpkgs-branch
-I /etc/nixos
</code></pre></div>
<p>will cause Lix to search for <code>&lt;nixpkgs/path&gt;</code> in
<code>/home/eelco/Dev/nixpkgs-branch/path</code> and <code>/etc/nixos/nixpkgs/path</code>.</p>
<p>If a path in the Nix search path starts with <code>http://</code> or <code>https://</code>,
it is interpreted as the URL of a tarball that will be downloaded and
unpacked to a temporary location. The tarball must consist of a single
top-level directory. For example, passing</p>
<div class="highlight"><pre><span></span><code>-I nixpkgs=https://github.com/NixOS/nixpkgs/archive/master.tar.gz
</code></pre></div>
<p>tells Lix to download and use the current contents of the <code>master</code>
branch in the <code>nixpkgs</code> repository.</p>
<p>The URLs of the tarballs from the official <code>nixos.org</code> channels
(see <a href="../../nix-channel/">the manual page for <code>nix-channel</code></a>) can be
abbreviated as <code>channel:&lt;channel-name&gt;</code>. For instance, the
following two flags are equivalent:</p>
<div class="highlight"><pre><span></span><code>-I nixpkgs=channel:nixos-21.05
-I nixpkgs=https://nixos.org/channels/nixos-21.05/nixexprs.tar.xz
</code></pre></div>
<p>You can also fetch source trees using <a href="../nix3-flake/#url-like-syntax">flake URLs</a> and add them to the
search path. For instance,</p>
<div class="highlight"><pre><span></span><code>-I nixpkgs=flake:nixpkgs
</code></pre></div>
<p>specifies that the prefix <code>nixpkgs</code> shall refer to the source tree
downloaded from the <code>nixpkgs</code> entry in the flake registry. Similarly,</p>
<div class="highlight"><pre><span></span><code>-I nixpkgs=flake:github:NixOS/nixpkgs/nixos-22.05
</code></pre></div>
<p>makes <code>&lt;nixpkgs&gt;</code> refer to a particular branch of the
<code>NixOS/nixpkgs</code> repository on GitHub.</p>
<ul>
<li><span id="opt-override-flake"><a href="#opt-override-flake"><code>--override-flake</code></a></span> <em>original-ref</em> <em>resolved-ref</em>
Override the flake registries, redirecting <em>original-ref</em> to <em>resolved-ref</em>.</li>
</ul>
<p><strong>Common flake-related options:</strong></p>
<ul>
<li>
<p><span id="opt-commit-lock-file"><a href="#opt-commit-lock-file"><code>--commit-lock-file</code></a></span>
Commit changes to the flake's lock file.</p>
</li>
<li>
<p><span id="opt-inputs-from"><a href="#opt-inputs-from"><code>--inputs-from</code></a></span> <em>flake-url</em>
Use the inputs of the specified flake as registry entries.</p>
</li>
<li>
<p><span id="opt-no-registries"><a href="#opt-no-registries"><code>--no-registries</code></a></span>
Don't allow lookups in the flake registries. This option is deprecated; use <code>--no-use-registries</code>.</p>
</li>
<li>
<p><span id="opt-no-update-lock-file"><a href="#opt-no-update-lock-file"><code>--no-update-lock-file</code></a></span>
Do not allow any updates to the flake's lock file.</p>
</li>
<li>
<p><span id="opt-no-write-lock-file"><a href="#opt-no-write-lock-file"><code>--no-write-lock-file</code></a></span>
Do not write the flake's newly generated lock file.</p>
</li>
<li>
<p><span id="opt-output-lock-file"><a href="#opt-output-lock-file"><code>--output-lock-file</code></a></span> <em>flake-lock-path</em>
Write the given lock file instead of <code>flake.lock</code> within the top-level flake.</p>
</li>
<li>
<p><span id="opt-override-input"><a href="#opt-override-input"><code>--override-input</code></a></span> <em>input-path</em> <em>flake-url</em>
Override a specific flake input (e.g. <code>dwarffs/nixpkgs</code>). This implies <code>--no-write-lock-file</code>.</p>
</li>
<li>
<p><span id="opt-reference-lock-file"><a href="#opt-reference-lock-file"><code>--reference-lock-file</code></a></span> <em>flake-lock-path</em>
Read the given lock file instead of <code>flake.lock</code> within the top-level flake.</p>
</li>
</ul>
<p><strong>Logging-related options:</strong></p>
<ul>
<li>
<p><span id="opt-debug"><a href="#opt-debug"><code>--debug</code></a></span>
Set the logging verbosity level to 'debug'.</p>
</li>
<li>
<p><span id="opt-log-format"><a href="#opt-log-format"><code>--log-format</code></a></span> <em>format</em>
Set the format of log output; one of <code>raw</code>, <code>internal-json</code>, <code>bar</code> or <code>bar-with-logs</code>.</p>
</li>
<li>
<p><span id="opt-print-build-logs"><a href="#opt-print-build-logs"><code>--print-build-logs</code></a></span> / <code>-L</code>
Print full build logs on standard error.</p>
</li>
<li>
<p><span id="opt-quiet"><a href="#opt-quiet"><code>--quiet</code></a></span>
Decrease the logging verbosity level.</p>
</li>
<li>
<p><span id="opt-verbose"><a href="#opt-verbose"><code>--verbose</code></a></span> / <code>-v</code>
Increase the logging verbosity level.</p>
</li>
</ul>
<p><strong>Miscellaneous global options:</strong></p>
<ul>
<li>
<p><span id="opt-help"><a href="#opt-help"><code>--help</code></a></span>
Show usage information.</p>
</li>
<li>
<p><span id="opt-offline"><a href="#opt-offline"><code>--offline</code></a></span>
Disable substituters and consider all previously downloaded files up-to-date.</p>
</li>
<li>
<p><span id="opt-option"><a href="#opt-option"><code>--option</code></a></span> <em>name</em> <em>value</em>
Set the Lix configuration setting <em>name</em> to <em>value</em> (overriding <code>nix.conf</code>).</p>
</li>
<li>
<p><span id="opt-refresh"><a href="#opt-refresh"><code>--refresh</code></a></span>
Consider all previously downloaded files out-of-date.</p>
</li>
<li>
<p><span id="opt-repair"><a href="#opt-repair"><code>--repair</code></a></span>
During evaluation, rewrite missing or corrupted files in the Nix store. During building, rebuild missing or corrupted store paths.</p>
</li>
<li>
<p><span id="opt-version"><a href="#opt-version"><code>--version</code></a></span>
Show version information.</p>
</li>
</ul>
<p><strong>Options that change the interpretation of <a href="../nix/#installables">installables</a>:</strong></p>
<ul>
<li>
<p><span id="opt-all"><a href="#opt-all"><code>--all</code></a></span>
Apply the operation to every store path.</p>
</li>
<li>
<p><span id="opt-derivation"><a href="#opt-derivation"><code>--derivation</code></a></span>
Operate on the <a href="../../../glossary/#gloss-store-derivation">store derivation</a> rather than its outputs.</p>
</li>
<li>
<p><span id="opt-expr"><a href="#opt-expr"><code>--expr</code></a></span> / <code>-E</code> <em>expr</em>
Interpret <a href="../nix/#installables"><em>installables</em></a> as attribute paths relative to the Nix expression <em>expr</em>.</p>
</li>
<li>
<p><span id="opt-file"><a href="#opt-file"><code>--file</code></a></span> / <code>-f</code> <em>file</em>
Interpret <a href="../nix/#installables"><em>installables</em></a> as attribute paths relative to the Nix expression stored in <em>file</em>. If <em>file</em> is the character -, then a Nix expression will be read from standard input. Implies <code>--impure</code>.</p>
</li>
<li>
<p><span id="opt-recursive"><a href="#opt-recursive"><code>--recursive</code></a></span> / <code>-r</code>
Apply operation to closure of the specified paths.</p>
</li>
</ul>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>See <a href="../../conf-file/#command-line-flags"><code>man nix.conf</code></a> for overriding configuration settings with command line flags.</p>
</div>
</article>
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