diff --git a/spcd.sh b/spcd.sh
index b0ef37c..76cb937 100755
--- a/spcd.sh
+++ b/spcd.sh
@@ -1,31 +1,30 @@
 #! /usr/bin/env sh
 
 gource \
---auto-skip-seconds 0.25 \
---date-format "%Y / %m / %d  ⋅  %H : %M : %S" \
---disable-input \
---font-scale 2.5 \
---frameless \
---hide mouse,usernames \
---highlight-dirs \
---key \
---multi-sampling \
---output-framerate 60 \
---output-ppm-stream - \
---seconds-per-day 0.6 \
---stop-at-end \
---viewport "1920x1080" \
-| \
-ffmpeg \
--codec:v ppm \
--format image2pipe \
--framerate 120 \
--i - \
--codec:v libx264 \
--preset veryslow \
--qp 28 \
--movflags \
-+faststart \
--pix_fmt yuv420p \
--y \
-spcd.mp4
+    --auto-skip-seconds 0.25 \
+    --date-format "%Y / %m / %d  ⋅  %H : %M : %S" \
+    --disable-input \
+    --font-scale 2.5 \
+    --frameless \
+    --hide mouse,usernames \
+    --highlight-dirs \
+    --key \
+    --multi-sampling \
+    --output-framerate 60 \
+    --output-ppm-stream - \
+    --seconds-per-day 0.6 \
+    --stop-at-end \
+    --viewport "1920x1080" |
+    ffmpeg \
+        -codec:v ppm \
+        -format image2pipe \
+        -framerate 120 \
+        -i - \
+        -codec:v libx264 \
+        -preset veryslow \
+        -qp 28 \
+        -movflags \
+        +faststart \
+        -pix_fmt yuv420p \
+        -y \
+        spcd.mp4
diff --git a/spcd/bootstrap.sh b/spcd/bootstrap.sh
index c0061ce..dbb40a5 100644
--- a/spcd/bootstrap.sh
+++ b/spcd/bootstrap.sh
@@ -211,54 +211,6 @@ _spcd_txt_pick() {
 # │ p = public │
 # ╰────────────╯
 
-spcd_ca() {
-    local grep="\(After\|Before\|Issuer\|Signature Algorithm\|Subject:\)"
-    local index name value
-    local root="${2}"
-    while true; do
-        index=$((index + 1))
-        name="SPCD_CA_${index}"
-        eval "value=\"\${${name}}\""
-        [ -n "${value}" ] || break
-        case "${1}" in
-        "list")
-            echo "${name} ="
-            echo "${value}" |
-                openssl x509 -noout -text |
-                grep "${grep}"
-            ;;
-        "write")
-            spcd_os_write "${root}/${index}.crt" "${value}"
-            ;;
-        *) ;;
-        esac
-    done
-}
-
-spcd_dns() {
-    local index name text value
-    while true; do
-        index=$((index + 1))
-        name="SPCD_DNS_${index}"
-        eval "value=\"\${${name}}\""
-        [ -n "${value}" ] || break
-        case "${1}" in
-        "list")
-            spcd_os_printenv "${name}"
-            ;;
-        "write")
-            text="${text}\
-nameserver ${value}
-"
-            ;;
-        *) ;;
-        esac
-    done
-    if [ "${1}" = "write" ]; then
-        spcd_os_write "/etc/resolv.conf" "${text}"
-    fi
-}
-
 spcd_run() {
     if [ -n "${1}" ]; then
         _spcd_frame_open "${@}"
@@ -425,8 +377,8 @@ SPCD_PM_ZYPPER="zypper"
 # ╰───┴───────────╯
 
 spcd_step__environment_print() {
-    spcd_ca "list"
-    spcd_dns "list"
+    spcd_f_ca "list"
+    spcd_f_dns "list"
     set -- \
         "GIT_RWX" \
         "GIT_SPCD" \
@@ -785,61 +737,166 @@ ${SPCD_PYTHON_VENV}/lib/${SPCD_PYTHON_COMMAND}/site-packages"
     spcd_os_printenv "SPCD_DL"
 }
 
-spcd_step__environment_list_workspace() {
-    spcd_step "List workspace"
-    spcd_os_ls "$(realpath .)"
-}
-
 # ╭──────────────╮
 # │ f = function │
 # ╰──────────────╯
 
-spcd_git_clone() {
-    if [ -n "${1}" ]; then
-        local name path url
-        name="$(basename "${1}")"
-        path="${SPCD_DL}/${name}"
-        url="$(spcd_git_url "${1}")"
-        git clone "${url}" "${path}"
-        echo "${path}"
-    fi
-}
-
-spcd_git_url() {
-    if [ -n "${1}" ]; then
+spcd_f_dns() {
+    local index name text value
+    while true; do
+        index=$((index + 1))
+        name="SPCD_DNS_${index}"
+        eval "value=\"\${${name}}\""
+        [ -n "${value}" ] || break
         case "${1}" in
-        http*) echo "${1}" ;;
-        */*) echo "${SPCD_PROJECT_ROOT}/${1}" ;;
-        *) echo "${SPCD_PROJECT_ROOT}/${SPCD_PROJECT_PATH}/${1}" ;;
+        "list")
+            spcd_os_printenv "${name}"
+            ;;
+        "write")
+            text="${text}\
+nameserver ${value}
+"
+            ;;
+        *) ;;
         esac
+    done
+    if [ "${1}" = "write" ]; then
+        spcd_os_write "/etc/resolv.conf" "${text}"
     fi
 }
 
-spcd_python_ln() {
-    local command="${1}"
-    if [ -n "${command}" ]; then
-        echo "→ ${SPCD_PYTHON_ALIAS} → ${command}"
-        ln -f -s "${command}" \
-            "/usr/bin/${SPCD_PYTHON_ALIAS}"
-    fi
-}
-
-spcd_python_pip() {
-    if [ -n "${1}" ]; then
-        local name path target
-        name="$(basename "${1}")"
-        path="$(spcd_git_clone "${1}")"
-        path="${path}/${name}"
-        target="${SPCD_PYTHON_VENV_PACKAGES}"
-        cp --recursive "${path}" "${target}"
-        echo "${target}/${name}"
-    fi
+spcd_f_pkg() {
+    spcd_step_in "OS packages"
+    local file
+    # epel
+    spcd_step "EPEL"
+    case "${SPCD_OS_ID}" in
+    "${SPCD_OS_ALMA}" | "${SPCD_OS_ROCKY}")
+        spcd_f_pm_pkg_install "epel-release"
+        case "${SPCD_OS_VERSION}" in
+        "9")
+            set -- \
+                "-testing" \
+                ""
+            ;;
+        "8")
+            set -- \
+                "-modular" \
+                "-testing-modular" \
+                "-testing" \
+                ""
+            ;;
+        *) ;;
+        esac
+        for file in "${@}"; do
+            spcd_os_sed "/etc/yum.repos.d/epel${file}.repo" \
+                "|^metalink|#metalink|" \
+                "|https://download.example/pub/epel|${SPCD_URL_EPEL}|" \
+                "|^#baseurl|baseurl|"
+        done
+        file="/etc/yum.repos.d/epel-cisco-openh264.repo"
+        if [ -f "${file}" ]; then
+            spcd_os_sed "${file}" \
+                "|^enabled=1|enabled=0|"
+        fi
+        ;;
+    *) ;;
+    esac
+    # graphviz
+    spcd_step "GraphViz"
+    spcd_f_pm_pkg_install "graphviz"
+    # openssh
+    spcd_step "OpenSSH"
+    case "${SPCD_PM}" in
+    "${SPCD_PM_APK}" | "${SPCD_PM_APT}")
+        spcd_f_pm_pkg_install "openssh-client"
+        ;;
+    "${SPCD_PM_DNF}" | "${SPCD_PM_ZYPPER}")
+        spcd_f_pm_pkg_install "openssh-clients"
+        ;;
+    "${SPCD_PM_PACMAN}") spcd_f_pm_pkg_install "openssh" ;;
+    *) ;;
+    esac
+    # plantuml
+    spcd_step "PlantUML"
+    spcd_f_pm_pkg_install "plantuml"
+    # rsync
+    spcd_step "Rsync"
+    spcd_f_pm_pkg_install "rsync"
+    # shell check
+    spcd_step "ShellCheck"
+    case "${SPCD_PM}" in
+    "${SPCD_PM_DNF}" | "${SPCD_PM_ZYPPER}")
+        spcd_f_pm_pkg_install "ShellCheck"
+        ;;
+    *) spcd_f_pm_pkg_install "shellcheck" ;;
+    esac
+    # shfmt
+    spcd_step "ShellFormat"
+    case "${SPCD_OS_ID}" in
+    "${SPCD_OS_ALMA}" | "${SPCD_OS_ROCKY}") ;;
+    "${SPCD_OS_DEBIAN}")
+        case "${SPCD_OS_VERSION}" in
+        "bullseye") ;;
+        *) spcd_f_pm_pkg_install "shfmt" ;;
+        esac
+        ;;
+    *) spcd_f_pm_pkg_install "shfmt" ;;
+    esac
+    spcd_step_out
 }
 
 # ╭───┬──────────────────────────────╮
 # │ f │ ca = certificate authorities │
 # ╰───┴──────────────────────────────╯
 
+spcd_f_ca() {
+    case "${1}" in
+    "list")
+        local grep="\(After\|Before\|Issuer\|Signature Algorithm\|Subject:\)"
+        ;;
+    "write")
+        local root
+        case "${SPCD_OS_ID}" in
+        "${SPCD_OS_ALMA}" | "${SPCD_OS_FEDORA}" | "${SPCD_OS_ROCKY}")
+            root="/etc/pki/ca-trust/source/anchors"
+            ;;
+        "${SPCD_OS_ALPINE}" | "${SPCD_OS_DEBIAN}" | "${SPCD_OS_UBUNTU}")
+            root="/usr/local/share/ca-certificates"
+            ;;
+        "${SPCD_OS_ARCH}")
+            root="/etc/ca-certificates/trust-source/anchors"
+            ;;
+        "${SPCD_OS_OPENSUSE}")
+            root="/etc/pki/trust/anchors"
+            ;;
+        *) ;;
+        esac
+        spcd_os_mkdir "${root}"
+        ;;
+    *) ;;
+    esac
+    local index name value
+    while true; do
+        index=$((index + 1))
+        name="SPCD_CA_${index}"
+        eval "value=\"\${${name}}\""
+        [ -n "${value}" ] || break
+        case "${1}" in
+        "list")
+            echo "${name} ="
+            echo "${value}" |
+                openssl x509 -noout -text |
+                grep "${grep}"
+            ;;
+        "write")
+            spcd_os_write "${root}/${index}.crt" "${value}"
+            ;;
+        *) ;;
+        esac
+    done
+}
+
 spcd_f_ca_install() {
     spcd_step "Install package"
     spcd_f_pm_pkg_install "ca-certificates"
@@ -864,40 +921,57 @@ spcd_f_ca_update() {
     esac
 }
 
-spcd_f_ca_write() {
-    spcd_step "Write certificates"
-    local root
-    case "${SPCD_OS_ID}" in
-    "${SPCD_OS_ALMA}" | "${SPCD_OS_FEDORA}" | "${SPCD_OS_ROCKY}")
-        root="/etc/pki/ca-trust/source/anchors"
-        ;;
-    "${SPCD_OS_ALPINE}" | "${SPCD_OS_DEBIAN}" | "${SPCD_OS_UBUNTU}")
-        root="/usr/local/share/ca-certificates"
-        ;;
-    "${SPCD_OS_ARCH}")
-        root="/etc/ca-certificates/trust-source/anchors"
-        ;;
-    "${SPCD_OS_OPENSUSE}")
-        root="/etc/pki/trust/anchors"
-        ;;
-    *) ;;
-    esac
-    spcd_os_mkdir "${root}"
-    spcd_ca "write" "${root}"
+# ╭───┬───────────────────╮
+# │ f │ env = environment │
+# ╰───┴───────────────────╯
+
+spcd_f_env_workspace() {
+    spcd_os_ls "$(realpath .)"
+}
+
+# ╭───┬─────╮
+# │ f │ git │
+# ╰───┴─────╯
+
+spcd_f_git_clone() {
+    if [ -n "${1}" ]; then
+        local name path url
+        name="$(basename "${1}")"
+        path="${SPCD_DL}/${name}"
+        url="$(spcd_f_git_url "${1}")"
+        git clone "${url}" "${path}"
+        echo "${path}"
+    fi
+}
+
+spcd_f_git_url() {
+    if [ -n "${1}" ]; then
+        case "${1}" in
+        http*) echo "${1}" ;;
+        */*) echo "${SPCD_PROJECT_ROOT}/${1}" ;;
+        *) echo "${SPCD_PROJECT_ROOT}/${SPCD_PROJECT_PATH}/${1}" ;;
+        esac
+    fi
+}
+
+# ╭───┬───────────────╮
+# │ f │ pkg = package │
+# ╰───┴───────────────╯
+
+spcd_f_pkg_dos2unix() {
+    spcd_step "Install dos2unix"
+    spcd_f_pm_pkg_install "dos2unix"
+}
+
+spcd_f_pkg_git() {
+    spcd_step "Install Git"
+    spcd_f_pm_pkg_install "git"
 }
 
 # ╭───┬──────────────────────╮
 # │ f │ pm = package manager │
 # ╰───┴──────────────────────╯
 
-spcd_f_pm_install() {
-    spcd_step "Install tools"
-    case "${SPCD_PM}" in
-    "${SPCD_PM_APT}") spcd_f_pm_pkg_install "apt-utils" ;;
-    *) ;;
-    esac
-}
-
 # ╭───┬────┬───────╮
 # │ f │ pm │ https │
 # ╰───┴────┴───────╯
@@ -967,15 +1041,27 @@ spcd_f_pm_pkg_clean() {
 }
 
 spcd_f_pm_pkg_install() {
-    case "${SPCD_PM}" in
-    "${SPCD_PM_APK}") spcd_run apk add "${1}" ;;
-    "${SPCD_PM_APT}") spcd_run apt-get install --assume-yes "${1}" ;;
-    "${SPCD_PM_DNF}") spcd_run dnf install --assumeyes "${1}" ;;
-    "${SPCD_PM_PACMAN}") spcd_run pacman --sync --noconfirm "${1}" ;;
-    "${SPCD_PM_ZYPPER}") spcd_run zypper --non-interactive install "${1}" ;;
-    *) ;;
-    esac
-    spcd_f_pm_pkg_clean
+    if [ -n "${1}" ]; then
+        local name
+        for name in "${@}"; do
+            case "${SPCD_PM}" in
+            "${SPCD_PM_APK}") spcd_run apk add "${1}" ;;
+            "${SPCD_PM_APT}") spcd_run apt-get install --assume-yes "${1}" ;;
+            "${SPCD_PM_DNF}") spcd_run dnf install --assumeyes "${1}" ;;
+            "${SPCD_PM_PACMAN}") spcd_run pacman --sync --noconfirm "${1}" ;;
+            "${SPCD_PM_ZYPPER}")
+                spcd_run zypper --non-interactive install "${1}"
+                ;;
+            *) ;;
+            esac
+            spcd_f_pm_pkg_clean
+        done
+    else
+        case "${SPCD_PM}" in
+        "${SPCD_PM_APT}") spcd_f_pm_pkg_install "apt-utils" ;;
+        *) ;;
+        esac
+    fi
 }
 
 spcd_f_pm_pkg_query() {
@@ -1013,6 +1099,117 @@ spcd_f_pm_pkg_upgrade() {
     esac
 }
 
+# ╭───┬─────────────╮
+# │ f │ py = python │
+# ╰───┴─────────────╯
+
+spcd_f_py_clone() {
+    if [ -n "${1}" ]; then
+        local name path target
+        name="$(basename "${1}")"
+        path="$(spcd_f_git_clone "${1}")"
+        path="${path}/${name}"
+        target="${SPCD_PYTHON_VENV_PACKAGES}"
+        cp --recursive "${path}" "${target}"
+        echo "${target}/${name}"
+    fi
+}
+
+spcd_f_py_download() {
+    spcd_step_in "Modules"
+    local target path script check
+    target="${SPCD_PYTHON_VENV_PACKAGES}"
+    spcd_step "List"
+    spcd_os_ls "${target}"
+    spcd_step "Main"
+    path="$(spcd_f_py_clone "${SPCD_GIT_SPCD}")"
+    # check matching of file and variable
+    spcd_step "Check"
+    script="${path}/bootstrap.sh"
+    ls -l "${script}"
+    check="${script}.${_SPCD_CMD_SUM}"
+    "${_SPCD_CMD_SUM}" "${script}" >"${check}"
+    printf "%s" "${SPCD}" >"${script}"
+    ls -l "${script}"
+    dos2unix "${script}"
+    ls -l "${script}"
+    "${_SPCD_CMD_SUM}" -c "${check}" || spcd_error_ci "SPCD"
+    spcd_step "Root"
+    spcd_f_py_clone "${SPCD_GIT_RWX}"
+    spcd_step "List"
+    spcd_os_ls "${target}"
+    spcd_step_out
+}
+
+spcd_f_py_install() {
+    spcd_step "Install package"
+    spcd_f_pm_pkg_install "${SPCD_PYTHON_PACKAGE}"
+    spcd_step "Link alias to command"
+    spcd_f_py_link "${SPCD_PYTHON_COMMAND}"
+    # venv
+    spcd_step_in "Virtual environment"
+    spcd_step "Install package"
+    case "${SPCD_OS_ID}" in
+    "${SPCD_OS_DEBIAN}" | "${SPCD_OS_UBUNTU}")
+        spcd_f_pm_pkg_install "python3-venv"
+        ;;
+    *) ;;
+    esac
+    spcd_step "Configure PIP"
+    spcd_os_write "/etc/pip.conf" "\
+[global]
+index-url = ${SPCD_URL_PYTHON}/simple
+"
+    spcd_step "Create"
+    "${SPCD_PYTHON_ALIAS}" -m "venv" "${SPCD_PYTHON_VENV}"
+    spcd_step "Activate"
+    export PATH="${SPCD_PYTHON_VENV_BINARIES}:${PATH}"
+    export VIRTUAL_ENV="${SPCD_PYTHON_VENV}"
+    spcd_step_out
+}
+
+spcd_f_py_link() {
+    local command="${1}"
+    if [ -n "${command}" ]; then
+        echo "→ ${SPCD_PYTHON_ALIAS} → ${command}"
+        ln -f -s "${command}" \
+            "/usr/bin/${SPCD_PYTHON_ALIAS}"
+    fi
+}
+
+spcd_f_py_save() {
+    spcd_step "Save"
+    local variable value text index root
+    for variable in \
+        OS_ID OS_VERSION \
+        PROJECT_ROOT PROJECT_PATH PROJECT_NAME \
+        PYTHON_VENV_BINARIES PYTHON_VENV_PACKAGES \
+        OPEN DOWN VERT SPLT __UP SHUT; do
+        value="$(spcd_os_printenv "SPCD_${variable}")"
+        text="${text}${value}
+"
+    done
+    index=$((__SPCD_STEP_1_INDEX + 1))
+    for root in \
+        "${SPCD_PYTHON_PACKAGES}" "${SPCD_PYTHON_VENV_PACKAGES}"; do
+        spcd_os_write "${root}/env.py" "${text}
+SPCD_STEP = ${index}
+"
+    done
+}
+
+spcd_f_py_switch() {
+    spcd_step "Switch"
+    local name path
+    name="$(basename "${SPCD_GIT_SPCD}")"
+    path="$(realpath "${0}")"
+    echo "\
+${path}
+↓
+${SPCD_PYTHON_ALIAS} / ${name}"
+    "${SPCD_PYTHON_ALIAS}" -m "${name}"
+}
+
 # ╭───┬─────╮
 # │ f │ txt │
 # ╰───┴─────╯
@@ -1170,22 +1367,9 @@ ${name}.${_SPCD_TXT_CHARSET} ${_SPCD_TXT_CHARSET}
     esac
 }
 
-# ╭───┬──────╮
-# │ s = step │
-# ╰───┴──────╯
-
-# ╭───┬─────╮
-# │ s │ dns │
-# ╰───┴─────╯
-
-spcd_step__dns() {
-    spcd_step "DNS"
-    spcd_dns "write"
-}
-
-# ╭───┬──────────╮
-# │ s │ packages │
-# ╰───┴──────────╯
+# ╭──────┬──────────╮
+# │ step │ packages │
+# ╰──────┴──────────╯
 
 spcd_step__packages_set_repositories() {
     spcd_step "Set repositories"
@@ -1368,191 +1552,6 @@ Dir::Etc::SourceParts \"\";
     esac
 }
 
-# ╭───┬──────────╮
-# │ s │ packages │
-# ╰───┴──────────╯
-
-spcd_step__packages_install_dos2unix() {
-    spcd_step "Install dos2unix"
-    spcd_f_pm_pkg_install "dos2unix"
-}
-
-spcd_step__packages_install_git() {
-    spcd_step "Install Git"
-    spcd_f_pm_pkg_install "git"
-}
-
-# ╭───┬────────╮
-# │ s │ python │
-# ╰───┴────────╯
-
-spcd_step__python_install() {
-    spcd_step "Install package"
-    spcd_f_pm_pkg_install "${SPCD_PYTHON_PACKAGE}"
-    spcd_step "Link alias to command"
-    spcd_python_ln "${SPCD_PYTHON_COMMAND}"
-    # venv
-    spcd_step_in "Virtual environment"
-    spcd_step "Install package"
-    case "${SPCD_OS_ID}" in
-    "${SPCD_OS_DEBIAN}" | "${SPCD_OS_UBUNTU}")
-        spcd_f_pm_pkg_install "python3-venv"
-        ;;
-    *) ;;
-    esac
-    spcd_step "Configure PIP"
-    spcd_os_write "/etc/pip.conf" "\
-[global]
-index-url = ${SPCD_URL_PYTHON}/simple
-"
-    spcd_step "Create"
-    "${SPCD_PYTHON_ALIAS}" -m "venv" "${SPCD_PYTHON_VENV}"
-    spcd_step "Activate"
-    export PATH="${SPCD_PYTHON_VENV_BINARIES}:${PATH}"
-    export VIRTUAL_ENV="${SPCD_PYTHON_VENV}"
-    spcd_step_out
-}
-
-spcd_step__python_modules() {
-    spcd_step_in "Modules"
-    local target path script check
-    target="${SPCD_PYTHON_VENV_PACKAGES}"
-    spcd_step "List"
-    spcd_os_ls "${target}"
-    spcd_step "Main"
-    path="$(spcd_python_pip "${SPCD_GIT_SPCD}")"
-    # check matching of file and variable
-    spcd_step "Check"
-    script="${path}/bootstrap.sh"
-    ls -l "${script}"
-    check="${script}.${_SPCD_CMD_SUM}"
-    "${_SPCD_CMD_SUM}" "${script}" >"${check}"
-    printf "%s" "${SPCD}" >"${script}"
-    ls -l "${script}"
-    dos2unix "${script}"
-    ls -l "${script}"
-    "${_SPCD_CMD_SUM}" -c "${check}" || spcd_error_ci "SPCD"
-    spcd_step "Root"
-    spcd_python_pip "${SPCD_GIT_RWX}"
-    spcd_step "List"
-    spcd_os_ls "${target}"
-    spcd_step_out
-}
-
-spcd_step__install_packages() {
-    spcd_step_in "OS packages"
-    local file
-    # epel
-    spcd_step "EPEL"
-    case "${SPCD_OS_ID}" in
-    "${SPCD_OS_ALMA}" | "${SPCD_OS_ROCKY}")
-        spcd_f_pm_pkg_install "epel-release"
-        case "${SPCD_OS_VERSION}" in
-        "9")
-            set -- \
-                "-testing" \
-                ""
-            ;;
-        "8")
-            set -- \
-                "-modular" \
-                "-testing-modular" \
-                "-testing" \
-                ""
-            ;;
-        *) ;;
-        esac
-        for file in "${@}"; do
-            spcd_os_sed "/etc/yum.repos.d/epel${file}.repo" \
-                "|^metalink|#metalink|" \
-                "|https://download.example/pub/epel|${SPCD_URL_EPEL}|" \
-                "|^#baseurl|baseurl|"
-        done
-        file="/etc/yum.repos.d/epel-cisco-openh264.repo"
-        if [ -f "${file}" ]; then
-            spcd_os_sed "${file}" \
-                "|^enabled=1|enabled=0|"
-        fi
-        ;;
-    *) ;;
-    esac
-    # graphviz
-    spcd_step "GraphViz"
-    spcd_f_pm_pkg_install "graphviz"
-    # openssh
-    spcd_step "OpenSSH"
-    case "${SPCD_PM}" in
-    "${SPCD_PM_APK}" | "${SPCD_PM_APT}")
-        spcd_f_pm_pkg_install "openssh-client"
-        ;;
-    "${SPCD_PM_DNF}" | "${SPCD_PM_ZYPPER}")
-        spcd_f_pm_pkg_install "openssh-clients"
-        ;;
-    "${SPCD_PM_PACMAN}") spcd_f_pm_pkg_install "openssh" ;;
-    *) ;;
-    esac
-    # plantuml
-    spcd_step "PlantUML"
-    spcd_f_pm_pkg_install "plantuml"
-    # rsync
-    spcd_step "Rsync"
-    spcd_f_pm_pkg_install "rsync"
-    # shell check
-    spcd_step "ShellCheck"
-    case "${SPCD_PM}" in
-    "${SPCD_PM_DNF}" | "${SPCD_PM_ZYPPER}")
-        spcd_f_pm_pkg_install "ShellCheck"
-        ;;
-    *) spcd_f_pm_pkg_install "shellcheck" ;;
-    esac
-    # shfmt
-    spcd_step "ShellFormat"
-    case "${SPCD_OS_ID}" in
-    "${SPCD_OS_ALMA}" | "${SPCD_OS_ROCKY}") ;;
-    "${SPCD_OS_DEBIAN}")
-        case "${SPCD_OS_VERSION}" in
-        "bullseye") ;;
-        *) spcd_f_pm_pkg_install "shfmt" ;;
-        esac
-        ;;
-    *) spcd_f_pm_pkg_install "shfmt" ;;
-    esac
-    spcd_step_out
-}
-
-spcd_step__python_write_module() {
-    spcd_step "Write module"
-    local variable value text index root
-    for variable in \
-        OS_ID OS_VERSION \
-        PROJECT_ROOT PROJECT_PATH PROJECT_NAME \
-        PYTHON_VENV_BINARIES PYTHON_VENV_PACKAGES \
-        OPEN DOWN VERT SPLT __UP SHUT; do
-        value="$(spcd_os_printenv "SPCD_${variable}")"
-        text="${text}${value}
-"
-    done
-    index=$((__SPCD_STEP_1_INDEX + 1))
-    for root in \
-        "${SPCD_PYTHON_PACKAGES}" "${SPCD_PYTHON_VENV_PACKAGES}"; do
-        spcd_os_write "${root}/env.py" "${text}
-SPCD_STEP = ${index}
-"
-    done
-}
-
-spcd_step__python_switch() {
-    spcd_step "Switch"
-    local name path
-    name="$(basename "${SPCD_GIT_SPCD}")"
-    path="$(realpath "${0}")"
-    echo "\
-${path}
-↓
-${SPCD_PYTHON_ALIAS} / ${name}"
-    "${SPCD_PYTHON_ALIAS}" -m "${name}"
-}
-
 # ╭──────╮
 # │ main │
 # ╰──────╯
@@ -1568,17 +1567,19 @@ spcd_main() {
     spcd_step__environment_print
     spcd_step_out
     spcd_step__environment_set_variables
-    spcd_step__environment_list_workspace
+    spcd_step "List workspace"
+    spcd_f_env_workspace
     spcd_step_out
     # dns
-    spcd_step__dns
+    spcd_step "DNS"
+    spcd_f_dns "write"
     # packages
     spcd_step_in "Packages"
     spcd_step__packages_set_repositories
     spcd_step__packages_set_configuration
     spcd_f_pm_https_trust
     spcd_f_pm_pkg_update
-    spcd_f_pm_install
+    spcd_f_pm_pkg_install
     # locales
     spcd_step_in "Locales"
     spcd_step "Install"
@@ -1592,7 +1593,7 @@ spcd_main() {
     # ca
     spcd_step_in "CA"
     spcd_f_ca_install
-    spcd_f_ca_write
+    spcd_f_ca "write"
     spcd_f_ca_update
     spcd_step_out
     # packages
@@ -1600,16 +1601,16 @@ spcd_main() {
     spcd_f_pm_https_verify
     spcd_f_pm_pkg_update
     spcd_f_pm_pkg_upgrade
-    spcd_step__packages_install_dos2unix
-    spcd_step__packages_install_git
+    spcd_f_pkg_dos2unix
+    spcd_f_pkg_git
     spcd_step_out
     # python
     spcd_step_in "Python"
-    spcd_step__python_install
-    spcd_step__python_modules
-    spcd_step__install_packages
-    spcd_step__python_write_module
-    spcd_step__python_switch
+    spcd_f_py_install
+    spcd_f_py_download
+    spcd_f_pkg
+    spcd_f_py_save
+    spcd_f_py_switch
 }
 
 spcd_main