diff --git a/scripts/relup-base-packages.sh b/scripts/relup-base-packages.sh
index 2999b8e0d..17f0d6ab4 100755
--- a/scripts/relup-base-packages.sh
+++ b/scripts/relup-base-packages.sh
@@ -1,4 +1,7 @@
 #!/usr/bin/env bash
+
+## This script helps to download relup base version packages
+
 if [[ -n "$DEBUG" ]]; then
     set -x
 fi
@@ -6,24 +9,27 @@ set -euo pipefail
 
 PROFILE="${1}"
 if [ "$PROFILE" = "" ]; then
-    $PROFILE="emqx"
+    PROFILE="emqx"
 fi
 
 case $PROFILE in
     "emqx")
-        DIR="broker"
+        DIR='broker'
+        EDITION='community'
         ;;
     "emqx-ee")
-        DIR="enterprise"
+        DIR='enterprise'
+        EDITION='enterprise'
         ;;
     "emqx-edge")
-        DIR="edge"
+        DIR='edge'
+        EDITION='edge'
         ;;
 esac
 
-SYSTEM="$(./scripts/get-distro.sh)"
+SYSTEM="${SYSTEM:-$(./scripts/get-distro.sh)}"
 
-ARCH="$(uname -m)"
+ARCH="${ARCH:-$(uname -m)}"
 case "$ARCH" in
     x86_64)
         ARCH='amd64'
@@ -47,16 +53,18 @@ cd -P -- "$(dirname -- "${BASH_SOURCE[0]}")/.."
 mkdir -p _upgrade_base
 pushd _upgrade_base
 
-for tag in $(../scripts/relup-base-vsns.sh community | xargs echo -n); do
-    if [ ! -f "$PROFILE-$SYSTEM-${tag#[e|v]}-$ARCH.zip" ] \
-    && [ ! -z "$(echo $(curl -I -m 10 -o /dev/null -s -w %{http_code} https://www.emqx.com/downloads/$DIR/$tag/$PROFILE-$SYSTEM-${tag#[e|v]}-$ARCH.zip) | grep -oE "^[23]+")" ];then
-        wget --no-verbose https://www.emqx.com/downloads/$DIR/$tag/$PROFILE-$SYSTEM-${tag#[e|v]}-$ARCH.zip
+for tag in $(../scripts/relup-base-vsns.sh $EDITION | xargs echo -n); do
+    filename="$PROFILE-$SYSTEM-${tag#[e|v]}-$ARCH.zip"
+    url="https://www.emqx.com/downloads/$DIR/$tag/$filename"
+    echo "downloading ${filename} ..."
+    if [ ! -f "$filename" ] && curl -I -m 10 -o /dev/null -s -w "%{http_code}" "${url}" | grep -q -oE "^[23]+" ; then
+        curl -L -o "${filename}" "${url}"
         if [ "$SYSTEM" != "centos6" ]; then
-            wget --no-verbose https://www.emqx.com/downloads/$DIR/$tag/$PROFILE-$SYSTEM-${tag#[e|v]}-$ARCH.zip.sha256
+            curl -L -o "${filename}.sha256" "${url}.sha256"
             ## https://askubuntu.com/questions/1202208/checking-sha256-checksum
-            echo "$(cat $PROFILE-$SYSTEM-${tag#[e|v]}-$ARCH.zip.sha256)  $PROFILE-$SYSTEM-${tag#[e|v]}-$ARCH.zip" | $SHASUM -c || exit 1
+            echo "$(cat "${filename}.sha256")  ${filename}" | $SHASUM -c || exit 1
         fi
     fi
-done 
+done
 
 popd
diff --git a/scripts/shellcheck.sh b/scripts/shellcheck.sh
index 5f8cdfd51..97445829f 100755
--- a/scripts/shellcheck.sh
+++ b/scripts/shellcheck.sh
@@ -3,7 +3,11 @@
 set -euo pipefail
 
 target_files=()
-while IFS='' read -r line; do target_files+=("$line"); done < <(grep -r -l --exclude-dir=.git --exclude-dir=_build "#!/bin/" .)
+while IFS='' read -r line;
+do
+  target_files+=("$line");
+done < <(git grep -r -l '^#!/\(bin/\|usr/bin/env bash\)' .)
+
 return_code=0
 for i in "${target_files[@]}"; do
   echo checking "$i" ...