diff --git a/.shellcheckrc b/.shellcheckrc
index fb50083..20ef482 100644
--- a/.shellcheckrc
+++ b/.shellcheckrc
@@ -1,3 +1,3 @@
-disable=2312
+disable=2312,3043
 enable=all
 shell=sh
diff --git a/readme.md b/readme.md
index ecb33bf..736eedb 100644
--- a/readme.md
+++ b/readme.md
@@ -225,9 +225,7 @@ Handle project workflows in a unified way:
 * comment
 * drawing characters constants
 * handle errors
-* locales
-  * set unicode C
-  * set unicode language
+* local variables
 * packages
   * configure
     * apk
diff --git a/spcd/bootstrap.sh b/spcd/bootstrap.sh
index c7a4f66..c80c600 100644
--- a/spcd/bootstrap.sh
+++ b/spcd/bootstrap.sh
@@ -5,12 +5,11 @@
 # ╰───╯
 
 _spcd_fill() {
-    _spcd_fill__index=${1}
-    while [ "${_spcd_fill__index}" -gt 0 ]; do
+    local index="${1}"
+    while [ "${index}" -gt 0 ]; do
         printf "%s" "${2}"
-        _spcd_fill__index=$((_spcd_fill__index - 1))
+        index=$((index - 1))
     done
-    unset _spcd_fill__index
 }
 
 # ╭───┬────────╮
@@ -28,35 +27,33 @@ _SPCD_BANNER_VERTICAL="│"
 
 _spcd_banner_add() {
     if [ -n "${1}" ]; then
-        spcd_ba__text=" ${1} "
-        spcd_ba__length=${#spcd_ba__text}
-        spcd_ba__filler="$(
-            _spcd_fill "${spcd_ba__length}" "${_SPCD_BANNER_HORIZONTAL}"
-        )"
+        local text=" ${1} "
+        local length=${#text}
+        local filler="$(_spcd_fill "${length}" "${_SPCD_BANNER_HORIZONTAL}")"
         if [ -n "${__SPCD_BANNER_MIDDLE}" ]; then
             _spcd_banner_split
         else
             _spcd_banner_open
         fi
-        _spcd_banner_append \
-            "${spcd_ba__filler}" "${spcd_ba__text}" "${spcd_ba__filler}"
+        _spcd_banner_append "${filler}" "${text}" "${filler}"
     fi
 }
 
 _spcd_banner_add_index() {
-    unset spcd_bai__label
-    unset spcd_bai__level
+    local label
+    local level
+    local value
     while true; do
-        spcd_bai__level=$((spcd_bai__level + 1))
-        eval "spcd_bai__value=\"\${__SPCD_STEP_${spcd_bai__level}_INDEX}\""
-        [ -n "${spcd_bai__value}" ] || break
-        if [ -n "${spcd_bai__label}" ]; then
-            spcd_bai__label="${spcd_bai__label}.${spcd_bai__value}"
+        level=$((level + 1))
+        eval "value=\"\${__SPCD_STEP_${level}_INDEX}\""
+        [ -n "${value}" ] || break
+        if [ -n "${label}" ]; then
+            label="${label}.${value}"
         else
-            spcd_bai__label="${spcd_bai__value}"
+            label="${value}"
         fi
     done
-    _spcd_banner_add "${spcd_bai__label}"
+    _spcd_banner_add "${label}"
 }
 
 _spcd_banner_append() {
@@ -86,12 +83,13 @@ _spcd_banner_render() {
     _spcd_banner_add "S"
     _spcd_banner_add_index
     #
-    unset spcd_br__level
+    local level
+    local value
     while true; do
-        spcd_br__level=$((spcd_br__level + 1))
-        eval "spcd_br__value=\"\${__SPCD_STEP_${spcd_br__level}_LABEL}\""
-        [ -n "${spcd_br__value}" ] || break
-        _spcd_banner_add "${spcd_br__value}"
+        level=$((level + 1))
+        eval "value=\"\${__SPCD_STEP_${level}_LABEL}\""
+        [ -n "${value}" ] || break
+        _spcd_banner_add "${value}"
     done
     #
     _spcd_banner_shut
@@ -223,10 +221,10 @@ spcd_openssl_x509() {
 # ╰───────────┴────╯
 
 spcd_os_grep() {
-    spcd_os_grep__variable="${1}"
-    [ -n "${spcd_os_grep__variable}" ] &&
-        grep "^${spcd_os_grep__variable}=" "/etc/os-release" |
-        sed "s|^${spcd_os_grep__variable}=||" |
+    local variable="${1}"
+    [ -n "${variable}" ] &&
+        grep "^${variable}=" "/etc/os-release" |
+        sed "s|^${variable}=||" |
             sed "s|^\"\(.*\)\"$|\1|"
 }
 
@@ -245,10 +243,11 @@ spcd_os_mkdir() {
 
 spcd_os_printenv() {
     if [ -n "${1}" ]; then
-        for spcd_os_printenv__name in "${@}"; do
-            spcd_os_printenv__text=""
-            eval "spcd_os_printenv__text=\"\${${spcd_os_printenv__name}}\""
-            echo "${spcd_os_printenv__name} = \"${spcd_os_printenv__text}\""
+        local name
+        local text
+        for name in "${@}"; do
+            eval "text=\"\${${name}}\""
+            echo "${name} = \"${text}\""
         done
     fi
 }
@@ -261,26 +260,27 @@ spcd_os_rm() {
 }
 
 spcd_os_sed() {
-    spcd_os_sed__file="${1}"
+    local file="${1}"
     shift
-    if [ -f "${spcd_os_sed__file}" ]; then
-        _spcd_os_cat "${spcd_os_sed__file}"
-        for spcd_os_sed__regex in "${@}"; do
-            sed --in-place "s${spcd_os_sed__regex}g" "${spcd_os_sed__file}" &&
-                _spcd_os_cat "${spcd_os_sed__file}"
+    if [ -f "${file}" ]; then
+        local regex
+        _spcd_os_cat "${file}"
+        for regex in "${@}"; do
+            sed --in-place "s${regex}g" "${file}" &&
+                _spcd_os_cat "${file}"
         done
     fi
 }
 
 spcd_os_write() {
-    spcd_os_write__file="${1}"
-    spcd_os_write__text="${2}"
-    if [ -n "${spcd_os_write__file}" ]; then
-        [ -f "${spcd_os_write__file}" ] &&
-            _spcd_os_cat "${spcd_os_write__file}"
-        echo "→ ${spcd_os_write__file}"
-        printf "%s" "${spcd_os_write__text}" >"${spcd_os_write__file}"
-        _spcd_os_cat "${spcd_os_write__file}"
+    local file="${1}"
+    local text="${2}"
+    if [ -n "${file}" ]; then
+        [ -f "${file}" ] &&
+            _spcd_os_cat "${file}"
+        echo "→ ${file}"
+        printf "%s" "${text}" >"${file}"
+        _spcd_os_cat "${file}"
     fi
 }