diff --git a/sh/alias/shell.sh b/sh/alias/shell.sh
new file mode 100644
index 0000000..8f6684c
--- /dev/null
+++ b/sh/alias/shell.sh
@@ -0,0 +1,30 @@
+# shorten alias
+a() {
+	alias \
+		"${@}"
+}
+
+# swap directory (current ↔ previous)
+sd() {
+	cd \
+		- ||
+		return
+}
+
+# exit terminal
+x() {
+	exit \
+		"${@}"
+}
+
+# shellcheck disable=SC2154
+[ "${SH_SHELL}" = "bash" ] || return
+
+# shellcheck disable=SC3033
+..() {
+	cd ..
+}
+# shellcheck disable=SC3033
+...() {
+	cd ../..
+}
diff --git a/sh/main.sh b/sh/main.sh
index 387b1b3..6369d05 100644
--- a/sh/main.sh
+++ b/sh/main.sh
@@ -1,4 +1,6 @@
 SH_NAME="sh"
+SH_SHELL="$(cat /proc/$$/comm)"
+export SH_SHELL
 
 SH_ROOT="/etc/${SH_NAME}"
 SH_USER="${HOME}/${SH_NAME}"
diff --git a/sh/sh.sh b/sh/sh.sh
index a1dc2d1..39dee54 100644
--- a/sh/sh.sh
+++ b/sh/sh.sh
@@ -2,8 +2,6 @@ PS1="\$(shell_prompt \${?})"
 PS2="\
 ├ "
 
-SH_SHELL="$(cat /proc/$$/comm)"
-
 shell_color() {
 	local code="${1}"
 	case "${SH_SHELL}" in
@@ -121,33 +119,3 @@ shell_setup() {
 	rm --force --recursive "${file}"
 	ln --symbolic "${ENV}" "${file}"
 }
-
-# shorten alias
-a() {
-	alias \
-		"${@}"
-}
-
-# swap directory (current ↔ previous)
-sd() {
-	cd \
-		- ||
-		return
-}
-
-# exit terminal
-x() {
-	exit \
-		"${@}"
-}
-
-[ "${SH_SHELL}" = "bash" ] || return
-
-# shellcheck disable=SC3033
-..() {
-	cd ..
-}
-# shellcheck disable=SC3033
-...() {
-	cd ../..
-}