diff --git a/install.sh b/install.sh
index 27b97e0..c0cbf20 100755
--- a/install.sh
+++ b/install.sh
@@ -50,7 +50,7 @@ install -v -D -m 755 ./src/exec $PREFIX/share/archbox/bin/exec
 install -v -D -m 755 ./src/enter $PREFIX/share/archbox/bin/enter
 install -v -D -m 755 ./src/chroot_setup $PREFIX/share/archbox/chroot_setup
 install -v -D -m 755 ./src/init $PREFIX/share/archbox/bin/init
-install -v -D -m 755 ./src/uth.bash $PREFIX/share/archbox/bin/uth
+install -v -D -m 755 ./src/uth $PREFIX/share/archbox/bin/uth
 
 grep 'PREFIX=' $ETC_DIR/archbox.conf >/dev/null 2>&1 || cat << EOF >> $ETC_DIR/archbox.conf
 
diff --git a/src/uth b/src/uth
new file mode 100644
index 0000000..836d536
--- /dev/null
+++ b/src/uth
@@ -0,0 +1,31 @@
+#!/bin/sh
+
+. /etc/archbox.conf >/dev/null 2>&1
+. /tmp/archbox_env >/dev/null 2>&1
+
+case $1 in
+    copyresolv)        
+        cp /etc/resolv.conf "${CHROOT}"/etc/resolv.conf
+        ;;
+    killxdg)
+        umount -l "${CHROOT}"/run
+        fuser -km $XDG_RUNTIME_DIR
+        exit $?
+        ;;
+    runtimeonly)
+        mkdir -p "${CHROOT}"${XDG_RUNTIME_DIR}
+        umount -Rl "${CHROOT}"${XDG_RUNTIME_DIR} 2>/dev/null
+        mount | grep "${CHROOT}"${XDG_RUNTIME_DIR} || \
+            mount --rbind $XDG_RUNTIME_DIR "${CHROOT}"${XDG_RUNTIME_DIR}
+        exit $?
+        ;;
+    remountrun)
+        umount -l "${CHROOT}"/run 2>/dev/null
+        mount --rbind /run "${CHROOT}"/run
+        exit $?
+        ;;
+    chownvar)
+        chown $2 /tmp/archbox_env
+        chmod 755 /tmp/archbox_env
+        ;;
+esac
diff --git a/src/uth.bash b/src/uth.bash
deleted file mode 100644
index b190f57..0000000
--- a/src/uth.bash
+++ /dev/null
@@ -1,31 +0,0 @@
-#!/usr/bin/env bash
-
-source /etc/archbox.conf &>/dev/null
-source /tmp/archbox_env &>/dev/null
-
-case $1 in
-    copyresolv)        
-        cp /etc/resolv.conf $CHROOT/etc/resolv.conf
-        ;;
-    killxdg)
-        umount -l $CHROOT/run
-        fuser -km $XDG_RUNTIME_DIR
-        exit $?
-        ;;
-    runtimeonly)
-        mkdir -p $CHROOT$XDG_RUNTIME_DIR
-        umount -Rl $CHROOT$XDG_RUNTIME_DIR 2>/dev/null
-        mount | grep $CHROOT$XDG_RUNTIME_DIR || \
-            mount --rbind $XDG_RUNTIME_DIR $CHROOT$XDG_RUNTIME_DIR
-        exit $?
-        ;;
-    remountrun)
-        umount -l $CHROOT/run 2>/dev/null
-        mount --rbind /run $CHROOT/run
-        exit $?
-        ;;
-    chownvar)
-        chown $2 /tmp/archbox_env
-        chmod 755 /tmp/archbox_env
-        ;;
-esac