diff --git a/spcd/bootstrap.sh b/spcd/bootstrap.sh
index 137ac96..0e1ce38 100644
--- a/spcd/bootstrap.sh
+++ b/spcd/bootstrap.sh
@@ -222,9 +222,8 @@ spcd_error_ci() {
 }
 
 spcd_error_os() {
-    spcd_error_os__variable="${1}"
     printf "× OS: "
-    spcd_os_printenv "${spcd_error_os__variable}"
+    spcd_os_printenv "${1}"
     exit "${_SPCD_ERROR_OS}"
 }
 
@@ -257,10 +256,9 @@ spcd_git_url() {
 # ╰───────────┴─────────╯
 
 spcd_openssl_x509() {
-    spcd_openssl_x509__file="${1}"
-    if [ -f "${spcd_openssl_x509__file}" ]; then
+    if [ -f "${1}" ]; then
         openssl x509 \
-            -in "${spcd_openssl_x509__file}" \
+            -in "${1}" \
             -noout -text
     fi
 }
@@ -278,20 +276,16 @@ spcd_os_grep() {
 }
 
 spcd_os_ls() {
-    spcd_os_ls__path="${1}"
-    if [ -n "${spcd_os_ls__path}" ]; then
-        _spcd_frame_open "${spcd_os_ls__path}"
-        ls -a -l "${spcd_os_ls__path}"
-        _spcd_frame_shut "${spcd_os_ls__path}"
+    if [ -n "${1}" ]; then
+        _spcd_frame_open "${1}"
+        ls -a -l "${1}"
+        _spcd_frame_shut "${1}"
     fi
 }
 
 spcd_os_mkdir() {
-    spcd_os_mkdir__path="${1}"
-    if [ -n "${spcd_os_mkdir__path}" ]; then
-        echo "→ ${spcd_os_mkdir__path}"
-        mkdir --parents "${spcd_os_mkdir__path}"
-    fi
+    echo "→ ${1}"
+    mkdir --parents "${1}"
 }
 
 spcd_os_printenv() {
@@ -335,30 +329,6 @@ spcd_os_write() {
     fi
 }
 
-# ╭───────────┬────────╮
-# │ functions │ python │
-# ╰───────────┴────────╯
-
-spcd_python_ln() {
-    spcd_python_ln__command="${1}"
-    if [ -n "${spcd_python_ln__command}" ]; then
-        echo "→ ${SPCD_PYTHON_ALIAS} → ${spcd_python_ln__command}"
-        ln -f -s "${spcd_python_ln__command}" \
-            "/usr/bin/${SPCD_PYTHON_ALIAS}"
-    fi
-}
-
-spcd_python_pip() {
-    if [ -n "${1}" ]; then
-        spcd_pp__name="$(basename "${1}")"
-        spcd_pp__path="$(spcd_git_clone "${1}")"
-        spcd_pp__path="${spcd_pp__path}/${spcd_pp__name}"
-        spcd_pp__target="${SPCD_PYTHON_VENV_PACKAGES}"
-        cp --recursive "${spcd_pp__path}" "${spcd_pp__target}"
-        echo "${spcd_pp__target}/${spcd_pp__name}"
-    fi
-}
-
 # ╭───────────┬───────╮
 # │ functions │ split │
 # ╰───────────┴───────╯
@@ -416,9 +386,6 @@ SPCD_PM_DNF="dnf"
 SPCD_PM_PACMAN="pacman"
 SPCD_PM_ZYPPER="zypper"
 
-SPCD_PYTHON_VENV="/opt/venv"
-SPCD_PYTHON_VENV_BINARIES="${SPCD_PYTHON_VENV}/bin"
-
 # ╭───────┬─────────────╮
 # │ steps │ environment │
 # ╰───────┴─────────────╯
@@ -514,9 +481,6 @@ ${SPCD_PROJECT_ROOT}$(basename "${GITHUB_SERVER_URL}")"
     #
     spcd_os_printenv "SPCD_PROJECT_BRANCH" \
         "SPCD_PROJECT_ROOT" "SPCD_PROJECT_PATH" "SPCD_PROJECT_NAME"
-    # set path
-    SPCD_PATH="$(realpath "${0}")"
-    spcd_os_printenv "SPCD_PATH"
     # set operating system id
     SPCD_OS_ID="$(spcd_os_grep ID)"
     case "${SPCD_OS_ID}" in
@@ -594,11 +558,6 @@ ${SPCD_PROJECT_ROOT}$(basename "${GITHUB_SERVER_URL}")"
     esac
     spcd_split
     spcd_os_printenv "SPCD_OS_ID" "SPCD_OS_VERSION"
-    # universal
-    SPCD_DNS_FILE="/etc/resolv.conf"
-    SPCD_PYTHON_ALIAS="python3"
-    spcd_split
-    spcd_os_printenv "SPCD_DNS_FILE" "SPCD_PYTHON_ALIAS"
     # set package manager
     case "${SPCD_OS_ID}" in
     "${SPCD_OS_ALPINE}")
@@ -618,9 +577,9 @@ ${SPCD_PROJECT_ROOT}$(basename "${GITHUB_SERVER_URL}")"
         ;;
     *) ;;
     esac
-    # set package manager variables
     spcd_split
     spcd_os_printenv "SPCD_PM"
+    # set package manager variables
     case "${SPCD_PM}" in
     "${SPCD_PM_DNF}")
         SPCD_PM_HTTPS_PATH="/etc/dnf/dnf.conf.d/https.conf"
@@ -719,6 +678,10 @@ Acquire::https::Verify-Peer False;
     esac
     spcd_split
     spcd_os_printenv "SPCD_URL_DEFAULT" "SPCD_URL_CHOSEN"
+    # set python alias
+    SPCD_PYTHON_ALIAS="python3"
+    spcd_split
+    spcd_os_printenv "SPCD_PYTHON_ALIAS"
     # set python command & package
     case "${SPCD_OS_ID}" in
     "${SPCD_OS_ALMA}" | "${SPCD_OS_ROCKY}")
@@ -788,6 +751,9 @@ Acquire::https::Verify-Peer False;
         ;;
     *) ;;
     esac
+    # set python virtual environment
+    SPCD_PYTHON_VENV="/opt/venv"
+    SPCD_PYTHON_VENV_BINARIES="${SPCD_PYTHON_VENV}/bin"
     SPCD_PYTHON_VENV_PACKAGES="\
 ${SPCD_PYTHON_VENV}/lib/${SPCD_PYTHON_COMMAND}/site-packages"
     spcd_split
@@ -831,6 +797,26 @@ spcd_install_package() {
     spcd_clean_cache
 }
 
+spcd_python_ln() {
+    spcd_python_ln__command="${1}"
+    if [ -n "${spcd_python_ln__command}" ]; then
+        echo "→ ${SPCD_PYTHON_ALIAS} → ${spcd_python_ln__command}"
+        ln -f -s "${spcd_python_ln__command}" \
+            "/usr/bin/${SPCD_PYTHON_ALIAS}"
+    fi
+}
+
+spcd_python_pip() {
+    if [ -n "${1}" ]; then
+        spcd_pp__name="$(basename "${1}")"
+        spcd_pp__path="$(spcd_git_clone "${1}")"
+        spcd_pp__path="${spcd_pp__path}/${spcd_pp__name}"
+        spcd_pp__target="${SPCD_PYTHON_VENV_PACKAGES}"
+        cp --recursive "${spcd_pp__path}" "${spcd_pp__target}"
+        echo "${spcd_pp__target}/${spcd_pp__name}"
+    fi
+}
+
 spcd_query_package() {
     case "${SPCD_PM}" in
     "${SPCD_PM_APK}") apk info "${1}" ;;
@@ -856,7 +842,7 @@ spcd_dns() {
 nameserver ${spcd_sdr__value}
 "
     done
-    spcd_os_write "${SPCD_DNS_FILE}" "${spcd_sdr__text}"
+    spcd_os_write "/etc/resolv.conf" "${spcd_sdr__text}"
 }
 
 # ╭───────┬──────────╮
@@ -1223,8 +1209,9 @@ SPCD_STEP = ${spcd_wpm__index}
 spcd_python_switch() {
     spcd_step "Switch"
     spcd_stp__name="$(basename "${SPCD_GIT_MAIN}")"
+    spcd_stp__path="$(realpath "${0}")"
     echo "\
-${SPCD_PATH}
+${spcd_stp__path}
 ↓
 ${SPCD_PYTHON_ALIAS} / ${spcd_stp__name}"
     "${SPCD_PYTHON_ALIAS}" -m "${spcd_stp__name}"