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<li class="md-nav__item">
<a href="../nix3-flake-archive/" class="md-nav__link">
<span class="md-ellipsis">
nix flake archive
</span>
</a>
</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>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-flake-info/" class="md-nav__link">
<span class="md-ellipsis">
nix flake info
</span>
</a>
</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>
</a>
</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>
</a>
</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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</li>
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<a href="../nix3-log/" class="md-nav__link">
<span class="md-ellipsis">
nix log
</span>
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</li>
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nix nar cat
</span>
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<span class="md-ellipsis">
nix nar dump-path
</span>
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<span class="md-ellipsis">
nix nar ls
</span>
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<a href="../nix3-nar/" class="md-nav__link">
<span class="md-ellipsis">
nix nar
</span>
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<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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<span class="md-ellipsis">
nix profile diff-closures
</span>
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<span class="md-ellipsis">
nix profile history
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<span class="md-ellipsis">
nix profile install
</span>
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nix profile list
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<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>
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<a href="../nix3-profile-upgrade/" class="md-nav__link">
<span class="md-ellipsis">
nix profile upgrade
</span>
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</li>
<li class="md-nav__item">
<a href="../nix3-profile-wipe-history/" class="md-nav__link">
<span class="md-ellipsis">
nix profile wipe-history
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-profile/" class="md-nav__link">
<span class="md-ellipsis">
nix profile
</span>
</a>
</li>
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<a href="../nix3-realisation-info/" class="md-nav__link">
<span class="md-ellipsis">
nix realisation info
</span>
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</li>
<li class="md-nav__item">
<a href="../nix3-realisation/" class="md-nav__link">
<span class="md-ellipsis">
nix realisation
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-registry-add/" class="md-nav__link">
<span class="md-ellipsis">
nix registry add
</span>
</a>
</li>
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<a href="../nix3-registry-list/" class="md-nav__link">
<span class="md-ellipsis">
nix registry list
</span>
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</li>
<li class="md-nav__item">
<a href="../nix3-registry-pin/" class="md-nav__link">
<span class="md-ellipsis">
nix registry pin
</span>
</a>
</li>
<li class="md-nav__item">
<a href="../nix3-registry-remove/" class="md-nav__link">
<span class="md-ellipsis">
nix registry remove
</span>
</a>
</li>
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<a href="../nix3-registry/" class="md-nav__link">
<span class="md-ellipsis">
nix registry
</span>
</a>
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<span class="md-ellipsis">
nix repl
</span>
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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
</span>
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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
</span>
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nix store delete
</span>
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<a href="../nix3-store-diff-closures/" class="md-nav__link">
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nix store diff-closures
</span>
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<a href="../nix3-store-dump-path/" class="md-nav__link">
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nix store dump-path
</span>
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<a href="../nix3-store-gc/" class="md-nav__link">
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nix store gc
</span>
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nix store ls
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nix store make-content-addressed
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nix store optimise
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nix store path-from-hash-part
</span>
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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 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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<article class="md-content__inner md-typeset">
<h1 id="nix-store-repair"><code>nix store repair</code></h1>
<p>Repair store paths.</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 repair</code> [<em>option</em>...] <em>installables</em>...</p>
<h2 id="examples">Examples</h2>
<ul>
<li>Repair a store path, after determining that it is corrupt:</li>
</ul>
<div class="highlight"><pre><span></span><code><span class="gp">#</span><span class="c1"># nix store verify /nix/store/yb5q57zxv6hgqql42d5r8b5k5mcq6kay-hello-2.10</span>
<span class="go">path &#39;/nix/store/yb5q57zxv6hgqql42d5r8b5k5mcq6kay-hello-2.10&#39; was</span>
<span class="go">modified! expected hash</span>
<span class="go">&#39;sha256:1hd5vnh6xjk388gdk841vflicy8qv7qzj2hb7xlyh8lpb43j921l&#39;, got</span>
<span class="go">&#39;sha256:1a25lf78x5wi6pfkrxalf0n13kdaca0bqmjqnp7wfjza2qz5ssgl&#39;</span>
<span class="gp">#</span><span class="c1"># nix store repair /nix/store/yb5q57zxv6hgqql42d5r8b5k5mcq6kay-hello-2.10</span>
</code></pre></div>
<h2 id="description">Description</h2>
<p>This command attempts to "repair" the store paths specified by
<a href="../nix/#installables"><em>installables</em></a> by redownloading them using the available
substituters. If no substitutes are available, then repair is not
possible.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
</div>
<blockquote>
<p>During repair, there is a very small time window during which the old
path (if it exists) is moved out of the way and replaced with the new
path. If repair is interrupted in between, then the system may be left
in a broken state (e.g., if the path contains a critical system
component like the GNU C Library).</p>
</blockquote>
<h2 id="options">Options</h2>
<ul>
<li><span id="opt-stdin"><a href="#opt-stdin"><code>--stdin</code></a></span>
Read installables from the standard input. No default installable applied.</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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