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<h1 id="nix-env"><code>nix-env</code></h1>
<p>Manipulate or query Nix user environments.</p>
<h2 id="synopsis">Synopsis</h2>
<p><code>nix-env</code> <em>operation</em> [<em>options</em>] [<em>arguments…</em>]
[<code>--option</code> <em>name</em> <em>value</em>]
[<code>--arg</code> <em>name</em> <em>value</em>]
[<code>--argstr</code> <em>name</em> <em>value</em>]
[{<code>--file</code> | <code>-f</code>} <em>path</em>]
[{<code>--profile</code> | <code>-p</code>} <em>path</em>]
[<code>--system-filter</code> <em>system</em>]
[<code>--dry-run</code>]</p>
<h2 id="description">Description</h2>
<p>The command <code>nix-env</code> is used to manipulate Nix user environments. User
environments are sets of software packages available to a user at some
point in time. In other words, they are a synthesised view of the
programs available in the Nix store. There may be many user
environments: different users can have different environments, and
individual users can switch between different environments.</p>
<p><code>nix-env</code> takes exactly one <em>operation</em> flag which indicates the
subcommand to be performed. The following operations are available:</p>
<ul>
<li><a href="install/"><code>--install</code></a> - add packages to user environment</li>
<li><a href="upgrade/"><code>--upgrade</code></a> - upgrade packages in user environment</li>
<li><a href="uninstall/"><code>--uninstall</code></a> - remove packages from user environment</li>
<li><a href="set/"><code>--set</code></a> - set profile to contain a specified derivation</li>
<li><a href="set-flag/"><code>--set-flag</code></a> - modify meta attributes of installed packages</li>
<li><a href="query/"><code>--query</code></a> - display information about packages</li>
<li><a href="switch-profile/"><code>--switch-profile</code></a> - set user environment to a given profile</li>
<li><a href="list-generations/"><code>--list-generations</code></a> - list profile generations</li>
<li><a href="delete-generations/"><code>--delete-generations</code></a> - delete profile generations</li>
<li><a href="switch-generation/"><code>--switch-generation</code></a> - set user environment to a given profile generation</li>
<li><a href="rollback/"><code>--rollback</code></a> - set user environment to previous generation</li>
</ul>
<p>These pages can be viewed offline:</p>
<ul>
<li><code>man nix-env-&lt;operation&gt;</code>.</li>
</ul>
<p>Example: <code>man nix-env-install</code></p>
<ul>
<li><code>nix-env --help --&lt;operation&gt;</code></li>
</ul>
<p>Example: <code>nix-env --help --install</code></p>
<h2 id="selectors">Selectors</h2>
<p>Several commands, such as <code>nix-env --query</code> and <code>nix-env --install</code>, take a list of
arguments that specify the packages on which to operate. These are
extended regular expressions that must match the entire name of the
package. (For details on regular expressions, see <strong>regex</strong>(7).) The match is
case-sensitive. The regular expression can optionally be followed by a
dash and a version number; if omitted, any version of the package will
match. Here are some examples:</p>
<ul>
<li>
<p><code>firefox</code>
Matches the package name <code>firefox</code> and any version.</p>
</li>
<li>
<p><code>firefox-32.0</code>
Matches the package name <code>firefox</code> and version <code>32.0</code>.</p>
</li>
<li>
<p><code>gtk+</code>
Matches the package name <code>gtk+</code>. The <code>+</code> character must be escaped
using a backslash to prevent it from being interpreted as a
quantifier, and the backslash must be escaped in turn with another
backslash to ensure that the shell passes it on.</p>
</li>
<li>
<p><code>.*</code>
Matches any package name. This is the default for most commands.</p>
</li>
<li>
<p><code>'.*zip.*'</code>
Matches any package name containing the string <code>zip</code>. Note the dots:
<code>'*zip*'</code> does not work, because in a regular expression, the
character <code>*</code> is interpreted as a quantifier.</p>
</li>
<li>
<p><code>'.*(firefox|chromium).*'</code>
Matches any package name containing the strings <code>firefox</code> or
<code>chromium</code>.</p>
</li>
</ul>
<h2 id="files">Files</h2>
<p><code>nix-env</code> operates on the following files.</p>
<h3 id="default-nix-expression">Default Nix expression</h3>
<p>The source for the default <a href="../../language/">Nix expressions</a> used by [<code>nix-env</code>]:</p>
<ul>
<li><code>~/.nix-defexpr</code></li>
<li><code>$XDG_STATE_HOME/nix/defexpr</code> if [<code>use-xdg-base-directories</code>] is set to <code>true</code>.</li>
</ul>
<p>It is loaded as follows:</p>
<ul>
<li>If the default expression is a file, it is loaded as a Nix expression.</li>
<li>If the default expression is a directory containing a <code>default.nix</code> file, that <code>default.nix</code> file is loaded as a Nix expression.</li>
<li>If the default expression is a directory without a <code>default.nix</code> file, then its contents (both files and subdirectories) are loaded as Nix expressions.
The expressions are combined into a single attribute set, each expression under an attribute with the same name as the original file or subdirectory.
Subdirectories without a <code>default.nix</code> file are traversed recursively in search of more Nix expressions, but the names of these intermediate directories are not added to the attribute paths of the default Nix expression.</li>
</ul>
<p>Then, the resulting expression is interpreted like this:</p>
<ul>
<li>If the expression is an attribute set, it is used as the default Nix expression.</li>
<li>If the expression is a function, an empty set is passed as argument and the return value is used as the default Nix expression.</li>
</ul>
<p>For example, if the default expression contains two files, <code>foo.nix</code> and <code>bar.nix</code>, then the default Nix expression will be equivalent to</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span>
<span class="ss">foo</span> <span class="o">=</span> <span class="nb">import</span> <span class="l">~/.nix-defexpr/foo.nix</span><span class="p">;</span>
<span class="ss">bar</span> <span class="o">=</span> <span class="nb">import</span> <span class="l">~/.nix-defexpr/bar.nix</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
<p>The file <a href="../files/manifest.nix/"><code>manifest.nix</code></a> is always ignored.</p>
<p>The command [<code>nix-channel</code>] places a symlink to the user's current <a href="../files/channels/">channels profile</a> in this directory.
This makes all subscribed channels available as attributes in the default expression.</p>
<h3 id="user-channel-link">User channel link</h3>
<p>A symlink that ensures that [<code>nix-env</code>] can find your channels:</p>
<ul>
<li><code>~/.nix-defexpr/channels</code></li>
<li><code>$XDG_STATE_HOME/defexpr/channels</code> if [<code>use-xdg-base-directories</code>] is set to <code>true</code>.</li>
</ul>
<p>This symlink points to:</p>
<ul>
<li><code>$XDG_STATE_HOME/profiles/channels</code> for regular users</li>
<li><code>$NIX_STATE_DIR/profiles/per-user/root/channels</code> for <code>root</code></li>
</ul>
<p>In a multi-user installation, you may also have <code>~/.nix-defexpr/channels_root</code>, which links to the channels of the root user.[<code>nix-env</code>]: ...md</p>
<h3 id="profiles">Profiles</h3>
<p>A directory that contains links to profiles managed by [<code>nix-env</code>] and [<code>nix profile</code>]:</p>
<ul>
<li><code>$XDG_STATE_HOME/nix/profiles</code> for regular users</li>
<li><code>$NIX_STATE_DIR/profiles/per-user/root</code> if the user is <code>root</code></li>
</ul>
<p>A profile is a directory of symlinks to files in the Nix store.</p>
<h4 id="filesystem-layout">Filesystem layout</h4>
<p>Profiles are versioned as follows. When using a profile named <em>path</em>, <em>path</em> is a symlink to <em>path</em><code>-</code><em>N</em><code>-link</code>, where <em>N</em> is the version of the profile.
In turn, <em>path</em><code>-</code><em>N</em><code>-link</code> is a symlink to a path in the Nix store.
For example:</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>ls<span class="w"> </span>-l<span class="w"> </span>~alice/.local/state/nix/profiles/profile*
<span class="go">lrwxrwxrwx 1 alice users 14 Nov 25 14:35 /home/alice/.local/state/nix/profiles/profile -&gt; profile-7-link</span>
<span class="go">lrwxrwxrwx 1 alice users 51 Oct 28 16:18 /home/alice/.local/state/nix/profiles/profile-5-link -&gt; /nix/store/q69xad13ghpf7ir87h0b2gd28lafjj1j-profile</span>
<span class="go">lrwxrwxrwx 1 alice users 51 Oct 29 13:20 /home/alice/.local/state/nix/profiles/profile-6-link -&gt; /nix/store/6bvhpysd7vwz7k3b0pndn7ifi5xr32dg-profile</span>
<span class="go">lrwxrwxrwx 1 alice users 51 Nov 25 14:35 /home/alice/.local/state/nix/profiles/profile-7-link -&gt; /nix/store/mp0x6xnsg0b8qhswy6riqvimai4gm677-profile</span>
</code></pre></div>
<p>Each of these symlinks is a root for the Lix garbage collector.</p>
<p>The contents of the store path corresponding to each version of the
profile is a tree of symlinks to the files of the installed packages,
e.g.</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>ll<span class="w"> </span>-R<span class="w"> </span>~eelco/.local/state/nix/profiles/profile-7-link/
<span class="go">/home/eelco/.local/state/nix/profiles/profile-7-link/:</span>
<span class="go">total 20</span>
<span class="go">dr-xr-xr-x 2 root root 4096 Jan 1 1970 bin</span>
<span class="go">-r--r--r-- 2 root root 1402 Jan 1 1970 manifest.nix</span>
<span class="go">dr-xr-xr-x 4 root root 4096 Jan 1 1970 share</span>
<span class="go">/home/eelco/.local/state/nix/profiles/profile-7-link/bin:</span>
<span class="go">total 20</span>
<span class="go">lrwxrwxrwx 5 root root 79 Jan 1 1970 chromium -&gt; /nix/store/ijm5k0zqisvkdwjkc77mb9qzb35xfi4m-chromium-86.0.4240.111/bin/chromium</span>
<span class="go">lrwxrwxrwx 7 root root 87 Jan 1 1970 spotify -&gt; /nix/store/w9182874m1bl56smps3m5zjj36jhp3rn-spotify-1.1.26.501.gbe11e53b-15/bin/spotify</span>
<span class="go">lrwxrwxrwx 3 root root 79 Jan 1 1970 zoom-us -&gt; /nix/store/wbhg2ga8f3h87s9h5k0slxk0m81m4cxl-zoom-us-5.3.469451.0927/bin/zoom-us</span>
<span class="go">/home/eelco/.local/state/nix/profiles/profile-7-link/share/applications:</span>
<span class="go">total 12</span>
<span class="go">lrwxrwxrwx 4 root root 120 Jan 1 1970 chromium-browser.desktop -&gt; /nix/store/4cf803y4vzfm3gyk3vzhzb2327v0kl8a-chromium-unwrapped-86.0.4240.111/share/applications/chromium-browser.desktop</span>
<span class="go">lrwxrwxrwx 7 root root 110 Jan 1 1970 spotify.desktop -&gt; /nix/store/w9182874m1bl56smps3m5zjj36jhp3rn-spotify-1.1.26.501.gbe11e53b-15/share/applications/spotify.desktop</span>
<span class="go">lrwxrwxrwx 3 root root 107 Jan 1 1970 us.zoom.Zoom.desktop -&gt; /nix/store/wbhg2ga8f3h87s9h5k0slxk0m81m4cxl-zoom-us-5.3.469451.0927/share/applications/us.zoom.Zoom.desktop</span>
<span class="go"></span>
</code></pre></div>
<p>Each profile version contains a manifest file:
- <a href="../files/manifest.nix/"><code>manifest.nix</code></a> used by <a href="..md"><code>nix-env</code></a>.
- <a href="../files/manifest.json/"><code>manifest.json</code></a> used by <a href="../New-CLI/nix3-profile/"><code>nix profile</code></a> (experimental).</p>
<h3 id="user-profile-link">User profile link</h3>
<p>A symbolic link to the user's current profile:</p>
<ul>
<li><code>~/.nix-profile</code></li>
<li><code>$XDG_STATE_HOME/nix/profile</code> if [<code>use-xdg-base-directories</code>] is set to <code>true</code>.</li>
</ul>
<p>By default, this symlink points to:</p>
<ul>
<li><code>$XDG_STATE_HOME/nix/profiles/profile</code> for regular users</li>
<li><code>$NIX_STATE_DIR/profiles/per-user/root/profile</code> for <code>root</code></li>
</ul>
<p>The <code>PATH</code> environment variable should include <code>/bin</code> subdirectory of the profile link (e.g. <code>~/.nix-profile/bin</code>) for the user environment to be visible to the user.
The <a href="../installation/installing-binary.md">installer</a> sets this up by default, unless you enable [<code>use-xdg-base-directories</code>].</p>
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