diff --git a/nick-shells/shell/baseline.sh b/nick-shells/shell/baseline.sh
index 40f29fbb..cb422366 100644
--- a/nick-shells/shell/baseline.sh
+++ b/nick-shells/shell/baseline.sh
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 # SPDX-License-Identifier: MPL-2.0 OR MPL-2.0
 # SPDX-FileCopyrightText: 2025 Jonathan D.A. Jewell <hyperpolymath>
 #
diff --git a/nick-shells/shell/examples/developer.sh b/nick-shells/shell/examples/developer.sh
index 72b497ec..cd7987f2 100644
--- a/nick-shells/shell/examples/developer.sh
+++ b/nick-shells/shell/examples/developer.sh
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 # SPDX-License-Identifier: MPL-2.0 OR MPL-2.0
 # SPDX-FileCopyrightText: 2025 Jonathan D.A. Jewell <hyperpolymath>
 #
diff --git a/nick-shells/shell/examples/interactive.sh b/nick-shells/shell/examples/interactive.sh
index 47d9ec9a..418dee60 100644
--- a/nick-shells/shell/examples/interactive.sh
+++ b/nick-shells/shell/examples/interactive.sh
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 # SPDX-License-Identifier: MPL-2.0 OR MPL-2.0
 # SPDX-FileCopyrightText: 2025 Jonathan D.A. Jewell <hyperpolymath>
 #
diff --git a/nick-shells/shell/examples/minimal.sh b/nick-shells/shell/examples/minimal.sh
index 3fb3f02b..f05f1f53 100644
--- a/nick-shells/shell/examples/minimal.sh
+++ b/nick-shells/shell/examples/minimal.sh
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 # SPDX-License-Identifier: MPL-2.0 OR MPL-2.0
 # SPDX-FileCopyrightText: 2025 Jonathan D.A. Jewell <hyperpolymath>
 #
diff --git a/nick-shells/shell/modules/aliases.sh b/nick-shells/shell/modules/aliases.sh
index 05cce606..c699e559 100644
--- a/nick-shells/shell/modules/aliases.sh
+++ b/nick-shells/shell/modules/aliases.sh
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 # SPDX-License-Identifier: MPL-2.0 OR MPL-2.0
 # SPDX-FileCopyrightText: 2025 Jonathan D.A. Jewell <hyperpolymath>
 #
diff --git a/nick-shells/shell/modules/behavior.sh b/nick-shells/shell/modules/behavior.sh
index 4e472eb6..5b4cfaec 100644
--- a/nick-shells/shell/modules/behavior.sh
+++ b/nick-shells/shell/modules/behavior.sh
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 # SPDX-License-Identifier: MPL-2.0 OR MPL-2.0
 # SPDX-FileCopyrightText: 2025 Jonathan D.A. Jewell <hyperpolymath>
 #
diff --git a/nick-shells/shell/modules/dev.sh b/nick-shells/shell/modules/dev.sh
index 1a5a95d7..2391c247 100644
--- a/nick-shells/shell/modules/dev.sh
+++ b/nick-shells/shell/modules/dev.sh
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 # SPDX-License-Identifier: MPL-2.0 OR MPL-2.0
 # SPDX-FileCopyrightText: 2025 Jonathan D.A. Jewell <hyperpolymath>
 #
diff --git a/nick-shells/shell/modules/editor.sh b/nick-shells/shell/modules/editor.sh
index 70c91663..96801599 100644
--- a/nick-shells/shell/modules/editor.sh
+++ b/nick-shells/shell/modules/editor.sh
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 # SPDX-License-Identifier: MPL-2.0 OR MPL-2.0
 # SPDX-FileCopyrightText: 2025 Jonathan D.A. Jewell <hyperpolymath>
 #
diff --git a/nick-shells/shell/modules/history.sh b/nick-shells/shell/modules/history.sh
index dd8a1f57..747a9d2b 100644
--- a/nick-shells/shell/modules/history.sh
+++ b/nick-shells/shell/modules/history.sh
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 # SPDX-License-Identifier: MPL-2.0 OR MPL-2.0
 # SPDX-FileCopyrightText: 2025 Jonathan D.A. Jewell <hyperpolymath>
 #
diff --git a/nick-shells/shell/modules/locale.sh b/nick-shells/shell/modules/locale.sh
index 2d71dbe5..a77f0e18 100644
--- a/nick-shells/shell/modules/locale.sh
+++ b/nick-shells/shell/modules/locale.sh
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 # SPDX-License-Identifier: MPL-2.0 OR MPL-2.0
 # SPDX-FileCopyrightText: 2025 Jonathan D.A. Jewell <hyperpolymath>
 #
diff --git a/nick-shells/shell/modules/path.sh b/nick-shells/shell/modules/path.sh
index 86491c4b..d5666fc9 100644
--- a/nick-shells/shell/modules/path.sh
+++ b/nick-shells/shell/modules/path.sh
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 # SPDX-License-Identifier: MPL-2.0 OR MPL-2.0
 # SPDX-FileCopyrightText: 2025 Jonathan D.A. Jewell <hyperpolymath>
 #
diff --git a/nick-shells/shell/modules/security.sh b/nick-shells/shell/modules/security.sh
index 77dddb6c..a42085d4 100644
--- a/nick-shells/shell/modules/security.sh
+++ b/nick-shells/shell/modules/security.sh
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 # SPDX-License-Identifier: MPL-2.0 OR MPL-2.0
 # SPDX-FileCopyrightText: 2025 Jonathan D.A. Jewell <hyperpolymath>
 #
diff --git a/nick-shells/shell/modules/xdg.sh b/nick-shells/shell/modules/xdg.sh
index 2b115d44..791ced8d 100644
--- a/nick-shells/shell/modules/xdg.sh
+++ b/nick-shells/shell/modules/xdg.sh
@@ -1,3 +1,4 @@
+# shellcheck shell=bash
 # SPDX-License-Identifier: MPL-2.0 OR MPL-2.0
 # SPDX-FileCopyrightText: 2025 Jonathan D.A. Jewell <hyperpolymath>
 #