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<li><a class="reference internal" href="#">fish_command_not_found - what to do when a command wasn’t found</a><ul>
<li><a class="reference internal" href="#synopsis">Synopsis</a></li>
<li><a class="reference internal" href="#description">Description</a></li>
<li><a class="reference internal" href="#example">Example</a></li>
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<section id="fish-command-not-found-what-to-do-when-a-command-wasn-t-found">
<h1>fish_command_not_found - what to do when a command wasn’t found<a class="headerlink" href="#fish-command-not-found-what-to-do-when-a-command-wasn-t-found" title="Link to this heading">¶</a></h1>
<section id="synopsis">
<h2>Synopsis<a class="headerlink" href="#synopsis" title="Link to this heading">¶</a></h2>
<div class="highlight-fish-synopsis notranslate"><div class="highlight"><pre><span></span><span class="nf">function</span><span class="w"> </span><span class="no">fish_command_not_found</span>
<span class="w"> </span><span class="g g-Other">...</span>
<span class="nf">end</span>
</pre></div>
</div>
</section>
<section id="description">
<h2>Description<a class="headerlink" href="#description" title="Link to this heading">¶</a></h2>
<p>When fish tries to execute a command and can’t find it, it invokes this function.</p>
<p>It can print a message to tell you about it, and it often also checks for a missing package that would include the command.</p>
<p>Fish ships multiple handlers for various operating systems and chooses from them when this function is loaded,
or you can define your own.</p>
<p>It receives the full commandline as one argument per token, so $argv[1] contains the missing command.</p>
<p>When you leave <code class="docutils literal notranslate"><span class="pre">fish_command_not_found</span></code> undefined (e.g. by adding an empty function file) or explicitly call <code class="docutils literal notranslate"><span class="pre">__fish_default_command_not_found_handler</span></code>, fish will just print a simple error.</p>
</section>
<section id="example">
<h2>Example<a class="headerlink" href="#example" title="Link to this heading">¶</a></h2>
<p>A simple handler:</p>
<div class="highlight-fish-docs-samples notranslate"><div class="highlight"><pre><span></span><span class="go">function fish_command_not_found</span>
<span class="go"> echo Did not find command $argv[1]</span>
<span class="go">end</span>
<span class="gp">> </span><span class="nf">flounder</span>
<span class="go">Did not find command flounder</span>
</pre></div>
</div>
<p>Or the handler for OpenSUSE’s command-not-found:</p>
<div class="highlight-fish-docs-samples notranslate"><div class="highlight"><pre><span></span><span class="nf">function</span><span class="w"> </span><span class="no">fish_command_not_found</span>
<span class="w"> </span><span class="nf">/usr/bin/command-not-found</span><span class="w"> </span><span class="o">$argv[</span><span class="no">1</span><span class="o">]</span>
<span class="nf">end</span>
</pre></div>
</div>
<p>Or the simple default handler:</p>
<div class="highlight-fish-docs-samples notranslate"><div class="highlight"><pre><span></span><span class="nf">function</span><span class="w"> </span><span class="no">fish_command_not_found</span>
<span class="w"> </span><span class="nf">__fish_default_command_not_found_handler</span><span class="w"> </span><span class="o">$argv</span>
<span class="nf">end</span>
</pre></div>
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</section>
<section id="backwards-compatibility">
<h2>Backwards compatibility<a class="headerlink" href="#backwards-compatibility" title="Link to this heading">¶</a></h2>
<p>This command was introduced in fish 3.2.0. Previous versions of fish used the “fish_command_not_found” <a class="reference internal" href="../language.html#event"><span class="std std-ref">event</span></a> instead.</p>
<p>To define a handler that works in older versions of fish as well, define it the old way:</p>
<div class="highlight-fish-docs-samples notranslate"><div class="highlight"><pre><span></span><span class="nf">function</span><span class="w"> </span><span class="no">__fish_command_not_found_handler</span><span class="w"> </span><span class="no">--on-event</span><span class="w"> </span><span class="no">fish_command_not_found</span>
<span class="w"> </span><span class="nf">echo</span><span class="w"> </span><span class="no">COMMAND</span><span class="w"> </span><span class="no">WAS</span><span class="w"> </span><span class="no">NOT</span><span class="w"> </span><span class="no">FOUND</span><span class="w"> </span><span class="no">MY</span><span class="w"> </span><span class="no">FRIEND</span><span class="w"> </span><span class="o">$argv[</span><span class="no">1</span><span class="o">]</span>
<span class="nf">end</span>
</pre></div>
</div>
<p>in which case fish will define a <code class="docutils literal notranslate"><span class="pre">fish_command_not_found</span></code> that calls it,
or define a wrapper:</p>
<div class="highlight-fish-docs-samples notranslate"><div class="highlight"><pre><span></span><span class="nf">function</span><span class="w"> </span><span class="no">fish_command_not_found</span>
<span class="w"> </span><span class="nf">echo</span><span class="w"> </span><span class="s2">"G'day mate, could not find your command: </span><span class="o">$argv</span><span class="s2">"</span>
<span class="nf">end</span>
<span class="nf">function</span><span class="w"> </span><span class="no">__fish_command_not_found_handler</span><span class="w"> </span><span class="no">--on-event</span><span class="w"> </span><span class="no">fish_command_not_found</span>
<span class="w"> </span><span class="nf">fish_command_not_found</span><span class="w"> </span><span class="o">$argv</span>
<span class="nf">end</span>
</pre></div>
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