diff --git a/cd.sh b/cd.sh
index 455a94b..84e7dbc 100644
--- a/cd.sh
+++ b/cd.sh
@@ -5,8 +5,9 @@ CD_DEFAULT_DNS="\
 9.9.9.9 \
 "
 
+CD_PYTHON_MODULE="cd"
 CD_PYTHON_MODULES="\
-cd \
+${CD_PYTHON_MODULE} \
 rwx \
 "
 
@@ -35,8 +36,8 @@ cd_main () {
     # TODO move to Python
     cd_install_ssh
     cd_clean_packages_cache
-    cd_install_python_modules ${CD_PYTHON_MODULES}
-    cd_execute_python_module ${CD_PYTHON_MODULES}
+    cd_install_python_modules
+    cd_execute_python_module "${@}"
 }
 
 # steps
@@ -540,7 +541,7 @@ local url
     cd_step "Install Python modules"
     root="$(mktemp --directory)" || exit
     echo "${root}"
-    for repository in "${@}" ; do
+    for repository in ${CD_PYTHON_MODULES} ; do
         cd_split
         url="${CD_PROJECTS_URL}/${repository}"
         echo -n "\
@@ -571,9 +572,9 @@ local self
     echo -n "\
 ${self}
 ↓
-${1}
+${CD_PYTHON_MODULE}
 "
-    "${CD_PYTHON_ALIAS}" -m "${1}" "${CD_STEP}" "${self}"
+    "${CD_PYTHON_ALIAS}" -m "${CD_PYTHON_MODULE}" "${@}"
 }
 
 # functions