diff --git a/spcd.sh b/spcd.sh
index b954910..d2fe8f7 100644
--- a/spcd.sh
+++ b/spcd.sh
@@ -265,8 +265,25 @@ ${SPCD_PROJECT_ROOT}$(basename "${GITHUB_SERVER_URL}")"
         ;;
     *) ;;
     esac
+    # set package format
+    case "${SPCD_PM}" in
+    "${SPCD_PM_APK}")
+        SPCD_PF="${SPCD_PF_APK}"
+        ;;
+    "${SPCD_PM_APT}")
+        SPCD_PF="${SPCD_PF_DEB}"
+        ;;
+    "${SPCD_PM_PACMAN}")
+        SPCD_PF="${SPCD_PF_PKG}"
+        ;;
+    "${SPCD_PM_DNF}" | "${SPCD_PM_ZYPPER}")
+        SPCD_PF="${SPCD_PF_RPM}"
+        ;;
+    *) ;;
+    esac
+    # set package manager variables
     spcd_split
-    spcd_echo "SPCD_PM"
+    spcd_echo "SPCD_PF" "SPCD_PM"
     case "${SPCD_PM}" in
     "${SPCD_PM_DNF}")
         SPCD_PM_CLEAN="dnf clean all"
@@ -780,8 +797,8 @@ spcd_install_packages() {
     spcd_install_package "rsync"
     # shell check
     spcd_substep "Install ShellCheck"
-    case "${SPCD_PM}" in
-    "${SPCD_PM_DNF}" | "${SPCD_PM_ZYPPER}")
+    case "${SPCD_PF}" in
+    "${SPCD_PF_RPM}")
         spcd_install_package "ShellCheck"
         ;;
     *) spcd_install_package "shellcheck" ;;
@@ -791,7 +808,10 @@ spcd_install_packages() {
     case "${SPCD_OS_ID}" in
     "${SPCD_OS_ALMA}" | "${SPCD_OS_ROCKY}") ;;
     "${SPCD_OS_DEBIAN}")
-        [ "${SPCD_OS_VERSION}" != "bullseye" ] && spcd_install_package "shfmt"
+        case "${SPCD_OS_VERSION}" in
+        "bullseye") ;;
+        *) spcd_install_package "shfmt" ;;
+        esac
         ;;
     *) spcd_install_package "shfmt" ;;
     esac
@@ -960,11 +980,11 @@ spcd_step() {
 spcd_substep() {
     SPCD_SUBSTEP=$((SPCD_SUBSTEP + 1))
     spcd_banner \
-    "${SPCD_STEP}.${SPCD_SUBSTEP}" \
-    "${SPCD_VERT}" \
-    "${SPCD_STEP_TEXT}" \
-    "${SPCD_VERT}" \
-    "${*}"
+        "${SPCD_STEP}.${SPCD_SUBSTEP}" \
+        "${SPCD_VERT}" \
+        "${SPCD_STEP_TEXT}" \
+        "${SPCD_VERT}" \
+        "${*}"
 }
 
 spcd_write() {
@@ -998,6 +1018,11 @@ SPCD_OS_OPENSUSE="opensuse"
 SPCD_OS_ROCKY="rocky"
 SPCD_OS_UBUNTU="ubuntu"
 
+SPCD_PF_APK="apk"
+SPCD_PF_DEB="deb"
+SPCD_PF_PKG="pkg"
+SPCD_PF_RPM="rpm"
+
 SPCD_PM_APK="apk"
 SPCD_PM_APT="apt"
 SPCD_PM_DNF="dnf"