diff --git a/install.sh b/install.sh
index 52fdf5e..715f156 100755
--- a/install.sh
+++ b/install.sh
@@ -4,55 +4,39 @@
 # CONSTANTS #
 #############
 
-# dependencies to run kiwi-config
-KIWI_DEPS="bash python3 pipenv less"
-# default install directory
+# default installation directory
 INSTALL_DIR_DEFAULT="/usr/local/bin"
 
-##########
-# CHECKS #
-##########
 
-printf "checking dependencies ... "
+############
+# CLI ARGS #
+############
 
-for dep in ${KIWI_DEPS}; do
-  printf "%s, " "${dep}"
+# installation directory
+install_dir="${1}"
+# adjust default if given
+INSTALL_DIR_DEFAULT="${1:-${INSTALL_DIR_DEFAULT}}"
 
-  if ! command -v "${dep}" >/dev/null 2>/dev/null; then
-    echo
-    echo "Dependency '${dep}' not found, please install!" >/dev/stderr
-    exit 1
-  fi
-done
-
-echo "OK"
 
 ########
 # MAIN #
 ########
 
 # prompt for installation directory
-valid="no"
-
-while [ "${valid}" = "no" ]; do
+while [ ! -d "${install_dir}" ]; do
   printf "Select installation directory [Default: '%s']: " "${INSTALL_DIR_DEFAULT}"
-  read install_dir </dev/tty || install_dir="${INSTALL_DIR_DEFAULT}"
+  read -r install_dir </dev/tty || install_dir="${INSTALL_DIR_DEFAULT}"
   install_dir="${install_dir:-${INSTALL_DIR_DEFAULT}}"
 
-  # check
-  if [ -d "${install_dir}" ]; then
-    valid="yes"
-
-  else
+  # check if given dir exists
+  if [ ! -d "${install_dir}" ]; then
     printf "Install directory doesn't exist. Try creating? [Y|n] "
-    read yesno </dev/tty || yesno="yes"
-    if [ ! "${yesno}" = "N" ] || [ ! "${yesno}" = "n" ]; then
+    read -r yesno </dev/tty || yesno="yes"
+    yesno=$(printf '%.1s' "${yesno}")
 
-      # check creation failure
-      if mkdir -p "${install_dir}"; then
-        valid="yes"
-
-      else
+    if [ ! "${yesno}" = "N" ] && [ ! "${yesno}" = "n" ]; then
+      # fail this script if we can't create the install dir
+      if ! mkdir -p "${install_dir}"; then
         echo "Invalid install directory." >/dev/stderr
         exit 1
       fi
@@ -60,6 +44,11 @@ while [ "${valid}" = "no" ]; do
   fi
 done
 
+if [ ! -d "${install_dir}" ]; then
+  echo "wtf?"
+  exit 1
+fi
+
 # start actual installation
 printf "Installing into '%s' ... " "${install_dir}"
 
diff --git a/kiwi b/kiwi
index f8b5bd5..dd34869 100755
--- a/kiwi
+++ b/kiwi
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 #############
 # CONSTANTS #
@@ -10,7 +10,7 @@ KIWI_CONF_NAME="kiwi.yml"
 KIWI_VERSION_TAG="etc/version_tag"
 
 # dependencies to run kiwi-config
-KIWI_DEPS=(docker docker-compose)
+KIWI_DEPS="python3 pipenv less docker docker-compose"
 # base install dir
 KIWI_BASEDIR="${HOME}/.local/lib/kiwi-config"
 # per-user env setup script
@@ -21,28 +21,30 @@ KIWI_REPO="https://github.com/ldericher/kiwi-config"
 # use latest version by default
 KIWI_VERSION="master"
 
+
 ###################
 # DYNAMIC STRINGS #
 ###################
 
 # directory of correct installation
-function kiwi_installdir() {
+kiwi_installdir() {
   echo "${KIWI_BASEDIR}/${KIWI_VERSION}"
 }
 
 # src directory in installed version
-function kiwi_root() {
+kiwi_root() {
   echo "$(kiwi_installdir)/src"
 }
 
 # main script in installed version
-function kiwi_executable() {
+kiwi_executable() {
   echo "$(kiwi_root)/kiwi-config.py"
 }
 
 # cache current work directory
 WORKDIR="$(pwd)"
 
+
 ##################
 # PER-USER SETUP #
 ##################
@@ -50,20 +52,22 @@ WORKDIR="$(pwd)"
 # add in environment setup
 if [ -f "${KIWI_ENVFILE}" ]; then
   # shellcheck source=$HOME/.kiwienv
-  source "${KIWI_ENVFILE}"
+  . "${KIWI_ENVFILE}"
 fi
 
+
 ##########
 # CHECKS #
 ##########
 
-for dep in "${KIWI_DEPS[@]}"; do
-  if ! command -v "${dep}" &>/dev/null; then
+for dep in ${KIWI_DEPS}; do
+  if ! command -v "${dep}" >/dev/null 2>/dev/null; then
     echo "Dependency '${dep}' not found, please install!" >/dev/stderr
     exit 1
   fi
 done
 
+
 ########
 # MAIN #
 ########
@@ -77,7 +81,7 @@ fi
 
 # install if kiwi-config not found
 if [ ! -x "$(kiwi_executable)" ]; then
-  echo -n "Installing kiwi-config v${KIWI_VERSION} into ${KIWI_BASEDIR} ... "
+  printf "Installing kiwi-config v%s into %s ... " "${KIWI_VERSION}" "${KIWI_BASEDIR}"
 
   # switch to temp dir
   tmpdir=$(mktemp -d)
@@ -92,7 +96,7 @@ if [ ! -x "$(kiwi_executable)" ]; then
 
   if [ -x "$(kiwi_executable)" ]; then
     # after version update: no need to install
-    echo "kiwi-config v${KIWI_VERSION} found!"
+    echo "v${KIWI_VERSION} already installed!"
 
   else
     # install archive
@@ -106,15 +110,6 @@ if [ ! -x "$(kiwi_executable)" ]; then
   rm -rf "${tmpdir}"
 fi
 
-# check virtualenv
-cd "$(kiwi_installdir)" || :
-if ! pipenv --venv &>/dev/null; then
-  # install virtualenv
-  echo -n "Preparing virtualenv ... "
-  pipenv sync &>/dev/null
-  echo "OK"
-fi
-
 # go back to the original work directory
 cd "${WORKDIR}" || :
 
@@ -123,10 +118,19 @@ KIWI_ROOT="$(kiwi_root)"
 PIPENV_VERBOSITY=-1
 PIPENV_PIPFILE="$(kiwi_installdir)/Pipfile"
 
-export KIWI_ROOT
 export KIWI_CONF_NAME
+export KIWI_ROOT
 export PIPENV_VERBOSITY
 export PIPENV_PIPFILE
 
+# check virtualenv
+cd "$(kiwi_installdir)" || :
+if ! pipenv --venv >/dev/null 2>/dev/null; then
+  # install virtualenv
+  printf "Preparing virtualenv ... "
+  pipenv sync >/dev/null 2>/dev/null
+  echo "OK"
+fi
+
 # run main script
 exec pipenv run "$(kiwi_executable)" "${@}"