diff --git a/QuickLook.Plugin/QuickLook.Plugin.TextViewer/Detectors/FormatDetector.cs b/QuickLook.Plugin/QuickLook.Plugin.TextViewer/Detectors/FormatDetector.cs
index a5c224a..abaee80 100644
--- a/QuickLook.Plugin/QuickLook.Plugin.TextViewer/Detectors/FormatDetector.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.TextViewer/Detectors/FormatDetector.cs
@@ -31,6 +31,7 @@ public class FormatDetector
         new MakefileDetector(),
         new HostsDetector(),
         new DockerfileDetector(),
+        new ShellScriptDetector(),
         new KrcDetector(),
     ];
 
diff --git a/QuickLook.Plugin/QuickLook.Plugin.TextViewer/Detectors/ShellScriptDetector.cs b/QuickLook.Plugin/QuickLook.Plugin.TextViewer/Detectors/ShellScriptDetector.cs
new file mode 100644
index 0000000..e15f43d
--- /dev/null
+++ b/QuickLook.Plugin/QuickLook.Plugin.TextViewer/Detectors/ShellScriptDetector.cs
@@ -0,0 +1,85 @@
+// Copyright © 2017-2026 QL-Win Contributors
+//
+// This file is part of QuickLook program.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
+using System.IO;
+
+namespace QuickLook.Plugin.TextViewer.Detectors;
+
+/// <summary>
+/// Detect whether a text file without suffix is ​​a shell script file
+/// </summary>
+public sealed class ShellScriptDetector : IFormatDetector
+{
+    public string Name => "Shell Script";
+
+    public string Extension => ".sh";
+
+    public bool Detect(string path, string text)
+    {
+        if (string.IsNullOrEmpty(text)) return false;
+
+        // Only handle files without extension
+        if (Path.GetExtension(path) != string.Empty)
+            return false;
+
+        ReadOnlySpan<char> span = text.AsSpan();
+
+        int i = 0;
+
+        // Skip UTF-8 BOM (\uFEFF) if present
+        if (span.Length > 0 && span[0] == '\uFEFF')
+            i = 1;
+
+        // Must start with shebang "#!"
+        if (span.Length < i + 2 || span[i] != '#' || span[i + 1] != '!')
+            return false;
+
+        i += 2;
+
+        // Skip whitespace after shebang
+        while (i < span.Length && (span[i] == ' ' || span[i] == '\t'))
+            i++;
+
+        // Read the first line only
+        int start = i;
+        while (i < span.Length && span[i] != '\n' && span[i] != '\r')
+            i++;
+
+        var line = span.Slice(start, i - start).Trim();
+
+        // Case 1: direct interpreter path (e.g. /bin/bash, /bin/sh)
+        if (line.Length >= 2 &&
+            line[line.Length - 2] == 's' &&
+            line[line.Length - 1] == 'h')
+            return true;
+
+        // Case 2: env style (e.g. /usr/bin/env bash)
+        int lastSpace = line.LastIndexOf(' ');
+        if (lastSpace >= 0)
+        {
+            var lastToken = line.Slice(lastSpace + 1);
+
+            if (lastToken.Length >= 2 &&
+                lastToken[lastToken.Length - 2] == 's' &&
+                lastToken[lastToken.Length - 1] == 'h')
+                return true;
+        }
+
+        return false;
+    }
+}