diff --git a/sh/main.sh b/sh/main.sh
index 2a351c9..83f0705 100644
--- a/sh/main.sh
+++ b/sh/main.sh
@@ -38,27 +38,7 @@ _sh_main_log() {
 	esac
 }
 
-#
-
-sh_source_check() {
-	local root="${1}"
-	local file module modules
-	file="$(mktemp)"
-	modules="$(sh_source_find "${root}")"
-	_sh_ifs_new
-	for module in ${modules}; do
-		echo ". \"${root}/${module}\"" >>"${file}"
-	done
-	_sh_ifs_pop
-	shellcheck \
-		--check-sourced \
-		--enable "all" \
-		--exclude "3043" \
-		--external-sources \
-		--shell "dash" \
-		"${file}"
-	rm "${file}"
-}
+# sort
 
 sh_source_find() {
 	local root="${1}"
@@ -120,6 +100,8 @@ main_source_file() {
 	fi
 }
 
+# public
+
 sh_help() {
 	sh_log \
 		"sh_… = shell functions" \
@@ -131,9 +113,11 @@ sh_main() {
 	main_source_file "${ENV}"
 	main_source_directory "${SH_USER}"
 	sh_log
-	sh_source_check "$(dirname "${ENV}")"
+	sh_shellcheck "$(dirname "${ENV}")"
 	sh_log
 	sh_help
 }
 
+# main
+
 sh_main
diff --git a/sh/shellcheck.sh b/sh/shellcheck.sh
new file mode 100644
index 0000000..d5ccb53
--- /dev/null
+++ b/sh/shellcheck.sh
@@ -0,0 +1,19 @@
+sh_shellcheck() {
+	local root="${1}"
+	local file module modules
+	file="$(mktemp)"
+	modules="$(sh_source_find "${root}")"
+	_sh_ifs_new
+	for module in ${modules}; do
+		echo ". \"${root}/${module}\"" >>"${file}"
+	done
+	_sh_ifs_pop
+	shellcheck \
+		--check-sourced \
+		--enable "all" \
+		--exclude "3043" \
+		--external-sources \
+		--shell "dash" \
+		"${file}"
+	rm "${file}"
+}