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<ol class="chapter"><li class="chapter-item expanded "><a href="chapter_1.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="chapter_2.html"><strong aria-hidden="true">1.1.</strong> Installation</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="chapter_3.html"><strong aria-hidden="true">1.1.1.</strong> Prerequisites</a></li><li class="chapter-item expanded "><a href="chapter_4.html"><strong aria-hidden="true">1.1.2.</strong> Packages</a></li><li class="chapter-item expanded "><a href="chapter_5.html"><strong aria-hidden="true">1.1.3.</strong> Pre-Built Binaries</a></li><li class="chapter-item expanded "><a href="chapter_6.html"><strong aria-hidden="true">1.1.4.</strong> GitHub Actions</a></li><li class="chapter-item expanded "><a href="chapter_7.html"><strong aria-hidden="true">1.1.5.</strong> Release RSS Feed</a></li></ol></li><li class="chapter-item expanded "><a href="chapter_8.html"><strong aria-hidden="true">1.2.</strong> Backwards Compatibility</a></li><li class="chapter-item expanded "><a href="chapter_9.html"><strong aria-hidden="true">1.3.</strong> Editor Support</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="chapter_10.html"><strong aria-hidden="true">1.3.1.</strong> Vim and Neovim</a></li><li class="chapter-item expanded "><a href="chapter_11.html"><strong aria-hidden="true">1.3.2.</strong> Emacs</a></li><li class="chapter-item expanded "><a href="chapter_12.html"><strong aria-hidden="true">1.3.3.</strong> Visual Studio Code</a></li><li class="chapter-item expanded "><a href="chapter_13.html"><strong aria-hidden="true">1.3.4.</strong> Kakoune</a></li><li class="chapter-item expanded "><a href="chapter_14.html"><strong aria-hidden="true">1.3.5.</strong> Sublime Text</a></li><li class="chapter-item expanded "><a href="chapter_15.html"><strong aria-hidden="true">1.3.6.</strong> Other Editors</a></li></ol></li><li class="chapter-item expanded "><a href="chapter_16.html"><strong aria-hidden="true">1.4.</strong> Quick Start</a></li><li class="chapter-item expanded "><a href="chapter_17.html"><strong aria-hidden="true">1.5.</strong> Examples</a></li><li class="chapter-item expanded "><a href="chapter_18.html"><strong aria-hidden="true">1.6.</strong> Features</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="chapter_19.html"><strong aria-hidden="true">1.6.1.</strong> The Default Recipe</a></li><li class="chapter-item expanded "><a href="chapter_20.html"><strong aria-hidden="true">1.6.2.</strong> Listing Available Recipes</a></li><li class="chapter-item expanded "><a href="chapter_21.html"><strong aria-hidden="true">1.6.3.</strong> Aliases</a></li><li class="chapter-item expanded "><a href="chapter_22.html" class="active"><strong aria-hidden="true">1.6.4.</strong> Settings</a></li><li class="chapter-item expanded "><a href="chapter_23.html"><strong aria-hidden="true">1.6.5.</strong> Documentation Comments</a></li><li class="chapter-item expanded "><a href="chapter_24.html"><strong aria-hidden="true">1.6.6.</strong> Dotenv Integration</a></li><li class="chapter-item expanded "><a href="chapter_25.html"><strong aria-hidden="true">1.6.7.</strong> Variables and Substitution</a></li><li class="chapter-item expanded "><a href="chapter_26.html"><strong aria-hidden="true">1.6.8.</strong> Strings</a></li><li class="chapter-item expanded "><a href="chapter_27.html"><strong aria-hidden="true">1.6.9.</strong> Ignoring Errors</a></li><li class="chapter-item expanded "><a href="chapter_28.html"><strong aria-hidden="true">1.6.10.</strong> Functions</a></li><li class="chapter-item expanded "><a href="chapter_29.html"><strong aria-hidden="true">1.6.11.</strong> Command Evaluation Using Backticks</a></li><li class="chapter-item expanded "><a href="chapter_30.html"><strong aria-hidden="true">1.6.12.</strong> Conditional Expressions</a></li><li class="chapter-item expanded "><a href="chapter_31.html"><strong aria-hidden="true">1.6.13.</strong> Stopping execution with error</a></li><li class="chapter-item expanded "><a href="chapter_32.html"><strong aria-hidden="true">1.6.14.</strong> Setting Variables from the Command Line</a></li><li class="chapter-item expanded "><a href="chapter_33.html"><strong aria-hidden="true">1.6.15.</strong> Getting and Setting Environment Variables</a></li><li class="chapter-item expanded "><a href="chapter_34.html"><strong aria-hidden="true">1.6.16.</strong> Recipe Parameters</a></li><li class="chapter-item expanded "><a href="chapter_35.html"><strong aria-hidden="true">1.6.17.</strong> Running Recipes at the End of a Recipe</a></li><li class="chapter-item expanded "><a href="chapter_36.html"><strong aria-hidden="true">1.6.18.</strong> Running Recipes in the Middle of a Recipe</a></li><li class="chapter-item expanded "><a href="chapter_37.html"><strong aria-hidden="true">1.6.19.</strong> Writing Recipes in Other Languages</a></li><li class="chapter-item expanded "><a href="chapter_38.html"><strong aria-hidden="true">1.6.20.</strong> Safer Bash Shebang Recipes</a></li><li class="chapter-item expanded "><a href="chapter_39.html"><strong aria-hidden="true">1.6.21.</strong> Setting Variables in a Recipe</a></li><li class="chapter-item expanded "><a href="chapter_40.html"><strong aria-hidden="true">1.6.22.</strong> Changing the Working Directory in a Recipe</a></li><li class="chapter-item expanded "><a href="chapter_41.html"><strong aria-hidden="true">1.6.23.</strong> Indentation</a></li><li class="chapter-item expanded "><a href="chapter_42.html"><strong aria-hidden="true">1.6.24.</strong> Multi-Line Constructs</a></li><li class="chapter-item expanded "><a href="chapter_43.html"><strong aria-hidden="true">1.6.25.</strong> Command Line Options</a></li><li class="chapter-item expanded "><a href="chapter_44.html"><strong aria-hidden="true">1.6.26.</strong> Private Recipes</a></li><li class="chapter-item expanded "><a href="chapter_45.html"><strong aria-hidden="true">1.6.27.</strong> Quiet Recipes</a></li><li class="chapter-item expanded "><a href="chapter_46.html"><strong aria-hidden="true">1.6.28.</strong> Selecting Recipes to Run With an Interactive Chooser</a></li><li class="chapter-item expanded "><a href="chapter_47.html"><strong aria-hidden="true">1.6.29.</strong> Invoking justfiles in Other Directories</a></li><li class="chapter-item expanded "><a href="chapter_48.html"><strong aria-hidden="true">1.6.30.</strong> Hiding justfiles</a></li><li class="chapter-item expanded "><a href="chapter_49.html"><strong aria-hidden="true">1.6.31.</strong> Just Scripts</a></li><li class="chapter-item expanded "><a href="chapter_50.html"><strong aria-hidden="true">1.6.32.</strong> Dumping justfiles as JSON</a></li><li class="chapter-item expanded "><a href="chapter_51.html"><strong aria-hidden="true">1.6.33.</strong> Falling back to parent justfiles</a></li></ol></li><li class="chapter-item expanded "><a href="chapter_52.html"><strong aria-hidden="true">1.7.</strong> Changelog</a></li><li class="chapter-item expanded "><a href="chapter_53.html"><strong aria-hidden="true">1.8.</strong> Miscellanea</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="chapter_54.html"><strong aria-hidden="true">1.8.1.</strong> Companion Tools</a></li><li class="chapter-item expanded "><a href="chapter_55.html"><strong aria-hidden="true">1.8.2.</strong> Shell Alias</a></li><li class="chapter-item expanded "><a href="chapter_56.html"><strong aria-hidden="true">1.8.3.</strong> Shell Completion Scripts</a></li><li class="chapter-item expanded "><a href="chapter_57.html"><strong aria-hidden="true">1.8.4.</strong> Grammar</a></li><li class="chapter-item expanded "><a href="chapter_58.html"><strong aria-hidden="true">1.8.5.</strong> just.sh</a></li><li class="chapter-item expanded "><a href="chapter_59.html"><strong aria-hidden="true">1.8.6.</strong> User justfiles</a></li><li class="chapter-item expanded "><a href="chapter_60.html"><strong aria-hidden="true">1.8.7.</strong> Node.js package.json Script Compatibility</a></li><li class="chapter-item expanded "><a href="chapter_61.html"><strong aria-hidden="true">1.8.8.</strong> Alternatives and Prior Art</a></li></ol></li><li class="chapter-item expanded "><a href="chapter_62.html"><strong aria-hidden="true">1.9.</strong> Contributing</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="chapter_63.html"><strong aria-hidden="true">1.9.1.</strong> Janus</a></li><li class="chapter-item expanded "><a href="chapter_64.html"><strong aria-hidden="true">1.9.2.</strong> Minimum Supported Rust Version</a></li></ol></li><li class="chapter-item expanded "><a href="chapter_65.html"><strong aria-hidden="true">1.10.</strong> Frequently Asked Questions</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="chapter_66.html"><strong aria-hidden="true">1.10.1.</strong> What are the idiosyncrasies of Make that Just avoids?</a></li><li class="chapter-item expanded "><a href="chapter_67.html"><strong aria-hidden="true">1.10.2.</strong> What’s the relationship between Just and Cargo build scripts?</a></li></ol></li><li class="chapter-item expanded "><a href="chapter_68.html"><strong aria-hidden="true">1.11.</strong> Further Ramblings</a></li></ol></li></ol>
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<main>
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<h3 id="settings"><a class="header" href="#settings">Settings</a></h3>
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<p>Settings control interpretation and execution. Each setting may be specified at most once, anywhere in the <code>justfile</code>.</p>
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<p>For example:</p>
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<pre><code class="language-make">set shell := ["zsh", "-cu"]
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foo:
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# this line will be run as `zsh -cu 'ls **/*.txt'`
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ls **/*.txt
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</code></pre>
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<h4 id="table-of-settings"><a class="header" href="#table-of-settings">Table of Settings</a></h4>
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<table><thead><tr><th>Name</th><th>Value</th><th>Description</th></tr></thead><tbody>
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<tr><td><code>allow-duplicate-recipes</code></td><td>boolean</td><td>Allow recipes appearing later in a <code>justfile</code> to override earlier recipes with the same name.</td></tr>
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<tr><td><code>dotenv-load</code></td><td>boolean</td><td>Load a <code>.env</code> file, if present.</td></tr>
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<tr><td><code>export</code></td><td>boolean</td><td>Export all variables as environment variables.</td></tr>
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<tr><td><code>positional-arguments</code></td><td>boolean</td><td>Pass positional arguments.</td></tr>
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<tr><td><code>shell</code></td><td><code>[COMMAND, ARGS…]</code></td><td>Set the command used to invoke recipes and evaluate backticks.</td></tr>
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<tr><td><code>windows-powershell</code></td><td>boolean</td><td>Use PowerShell on Windows as default shell.</td></tr>
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</tbody></table>
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<p>Boolean settings can be written as:</p>
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<pre><code class="language-mf">set NAME
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</code></pre>
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<p>Which is equivalent to:</p>
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<pre><code class="language-mf">set NAME := true
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</code></pre>
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<h4 id="allow-duplicate-recipes"><a class="header" href="#allow-duplicate-recipes">Allow Duplicate Recipes</a></h4>
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<p>If <code>allow-duplicate-recipes</code> is set to <code>true</code>, defining multiple recipes with the same name is not an error and the last definition is used. Defaults to <code>false</code>.</p>
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<pre><code class="language-make">set allow-duplicate-recipes
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@foo:
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echo foo
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@foo:
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echo bar
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</code></pre>
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<pre><code class="language-sh">$ just foo
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bar
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</code></pre>
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<h4 id="dotenv-load"><a class="header" href="#dotenv-load">Dotenv Load</a></h4>
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<p>If <code>dotenv-load</code> is <code>true</code>, a <code>.env</code> file will be loaded if present. Defaults to <code>false</code>.</p>
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<h4 id="export"><a class="header" href="#export">Export</a></h4>
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<p>The <code>export</code> setting causes all <code>just</code> variables to be exported as environment variables. Defaults to <code>false</code>.</p>
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<pre><code class="language-make">set export
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a := "hello"
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@foo b:
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echo $a
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echo $b
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</code></pre>
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<pre><code class="language-sh">$ just foo goodbye
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hello
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goodbye
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</code></pre>
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<h4 id="positional-arguments"><a class="header" href="#positional-arguments">Positional Arguments</a></h4>
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<p>If <code>positional-arguments</code> is <code>true</code>, recipe arguments will be passed as positional arguments to commands. For linewise recipes, argument <code>$0</code> will be the name of the recipe.</p>
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<p>For example, running this recipe:</p>
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<pre><code class="language-make">set positional-arguments
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@foo bar:
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echo $0
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echo $1
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</code></pre>
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<p>Will produce the following output:</p>
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<pre><code class="language-sh">$ just foo hello
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foo
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hello
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</code></pre>
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<p>When using an <code>sh</code>-compatible shell, such as <code>bash</code> or <code>zsh</code>, <code>$@</code> expands to the positional arguments given to the recipe, starting from one. When used within double quotes as <code>"$@"</code>, arguments including whitespace will be passed on as if they were double-quoted. That is, <code>"$@"</code> is equivalent to <code>"$1" "$2"</code>… When there are no positional parameters, <code>"$@"</code> and <code>$@</code> expand to nothing (i.e., they are removed).</p>
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<p>This example recipe will print arguments one by one on separate lines:</p>
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<pre><code class="language-make">set positional-arguments
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@test *args='':
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bash -c 'while (( "$#" )); do echo - $1; shift; done' -- "$@"
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</code></pre>
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<p>Running it with <em>two</em> arguments:</p>
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<pre><code class="language-sh">$ just test foo "bar baz"
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- foo
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- bar baz
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</code></pre>
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<h4 id="shell"><a class="header" href="#shell">Shell</a></h4>
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<p>The <code>shell</code> setting controls the command used to invoke recipe lines and backticks. Shebang recipes are unaffected.</p>
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<pre><code class="language-make"># use python3 to execute recipe lines and backticks
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set shell := ["python3", "-c"]
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# use print to capture result of evaluation
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foos := `print("foo" * 4)`
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foo:
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print("Snake snake snake snake.")
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print("{{foos}}")
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</code></pre>
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<p><code>just</code> passes the command to be executed as an argument. Many shells will need an additional flag, often <code>-c</code>, to make them evaluate the first argument.</p>
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<h5 id="windows-powershell"><a class="header" href="#windows-powershell">Windows PowerShell</a></h5>
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<p><code>just</code> uses <code>sh</code> on Windows by default. To use PowerShell instead, set <code>windows-powershell</code> to true.</p>
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<pre><code class="language-make">set windows-powershell := true
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hello:
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Write-Host "Hello, world!"
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</code></pre>
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<h5 id="python-3"><a class="header" href="#python-3">Python 3</a></h5>
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<pre><code class="language-make">set shell := ["python3", "-c"]
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</code></pre>
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<h5 id="bash"><a class="header" href="#bash">Bash</a></h5>
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<pre><code class="language-make">set shell := ["bash", "-uc"]
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</code></pre>
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<h5 id="z-shell"><a class="header" href="#z-shell">Z Shell</a></h5>
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<pre><code class="language-make">set shell := ["zsh", "-uc"]
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</code></pre>
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<h5 id="fish"><a class="header" href="#fish">Fish</a></h5>
|
||
<pre><code class="language-make">set shell := ["fish", "-c"]
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</code></pre>
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