diff --git a/functions.sh b/functions.sh
index be9c575396..4d96d7b813 100755
--- a/functions.sh
+++ b/functions.sh
@@ -21,25 +21,25 @@ fatal() {
 function get_arch() {
   local arch
   case $(uname -m) in
-    x86_64)
-      arch="amd64"
-      ;;
-    ppc64le)
-      arch="ppc64le"
-      ;;
-    s390x)
-      arch="s390x"
-      ;;
-    aarch64)
-      arch="arm64"
-      ;;
-    armv7l)
-      arch="arm32v7"
-      ;;
-    *)
-      echo "$0 does not support architecture ${arch} ... aborting"
-      exit 1
-      ;;
+  x86_64)
+    arch="amd64"
+    ;;
+  ppc64le)
+    arch="ppc64le"
+    ;;
+  s390x)
+    arch="s390x"
+    ;;
+  aarch64)
+    arch="arm64"
+    ;;
+  armv7l)
+    arch="arm32v7"
+    ;;
+  *)
+    echo "$0 does not support architecture ${arch} ... aborting"
+    exit 1
+    ;;
   esac
 
   echo "${arch}"
@@ -62,7 +62,7 @@ function get_variants() {
 
   arch=$(get_arch)
   variantsfilter=("$@")
-  IFS=' ' read -ra availablevariants <<< "$(grep "^${arch}" "${dir}/architectures" | sed -E 's/'"${arch}"'[[:space:]]*//' | sed -E 's/,/ /g')"
+  IFS=' ' read -ra availablevariants <<<"$(grep "^${arch}" "${dir}/architectures" | sed -E 's/'"${arch}"'[[:space:]]*//' | sed -E 's/,/ /g')"
 
   if [ ${#variantsfilter[@]} -gt 0 ]; then
     for variant1 in "${availablevariants[@]}"; do
@@ -100,16 +100,16 @@ function get_supported_arches() {
   shift
 
   # Get default supported arches
-  lines=$(grep "${variant}" "$(dirname "${version}")"/architectures 2> /dev/null | cut -d' ' -f1)
+  lines=$(grep "${variant}" "$(dirname "${version}")"/architectures 2>/dev/null | cut -d' ' -f1)
 
   # Get version specific supported architectures if there is specialized information
   if [ -a "${version}"/architectures ]; then
-    lines=$(grep "${variant}" "${version}"/architectures 2> /dev/null | cut -d' ' -f1)
+    lines=$(grep "${variant}" "${version}"/architectures 2>/dev/null | cut -d' ' -f1)
   fi
 
   while IFS='' read -r line; do
     arches+=("${line}")
-  done <<< "${lines}"
+  done <<<"${lines}"
 
   echo "${arches[@]}"
 }
@@ -140,7 +140,7 @@ function get_versions() {
 
   local default_variant
   default_variant=$(get_config "./" "default_variant")
-  IFS=' ' read -ra dirs <<< "$(echo "./"*/)"
+  IFS=' ' read -ra dirs <<<"$(echo "./"*/)"
 
   for dir in "${dirs[@]}"; do
     if [ -a "${dir}/Dockerfile" ] || [ -a "${dir}/${default_variant}/Dockerfile" ]; then
@@ -168,7 +168,7 @@ function is_debian() {
   variant=$1
   shift
 
-  IFS=' ' read -ra debianVersions <<< "$(get_config "./" "debian_versions")"
+  IFS=' ' read -ra debianVersions <<<"$(get_config "./" "debian_versions")"
   for d in "${debianVersions[@]}"; do
     if [ "${d}" = "${variant}" ]; then
       return 0
@@ -182,7 +182,7 @@ function is_debian_slim() {
   variant=$1
   shift
 
-  IFS=' ' read -ra debianVersions <<< "$(get_config "./" "debian_versions")"
+  IFS=' ' read -ra debianVersions <<<"$(get_config "./" "debian_versions")"
   for d in "${debianVersions[@]}"; do
     if [ "${d}-slim" = "${variant}" ]; then
       return 0
@@ -196,7 +196,7 @@ function get_fork_name() {
   version=$1
   shift
 
-  IFS='/' read -ra versionparts <<< "${version}"
+  IFS='/' read -ra versionparts <<<"${version}"
   if [ ${#versionparts[@]} -gt 1 ]; then
     echo "${versionparts[0]}"
   fi
@@ -282,7 +282,7 @@ function get_tag() {
   fi
 
   local tagparts
-  IFS=' ' read -ra tagparts <<< "$(get_fork_name "${version}") ${tagversion}"
+  IFS=' ' read -ra tagparts <<<"$(get_fork_name "${version}") ${tagversion}"
   IFS='-'
   echo "${tagparts[*]}"
   unset IFS
@@ -300,11 +300,11 @@ function sort_versions() {
 
   while IFS='' read -r line; do
     sorted+=("${line}")
-  done <<< "$(echo "${lines}" | grep "^[0-9]" | sort -r)"
+  done <<<"$(echo "${lines}" | grep "^[0-9]" | sort -r)"
 
   while IFS='' read -r line; do
     sorted+=("${line}")
-  done <<< "$(echo "${lines}" | grep -v "^[0-9]" | sort -r)"
+  done <<<"$(echo "${lines}" | grep -v "^[0-9]" | sort -r)"
 
   echo "${sorted[@]}"
 }
@@ -334,7 +334,7 @@ function images_updated() {
 
   commit_range="$(commit_range "$@")"
 
-  IFS=' ' read -ra versions <<< "$(
+  IFS=' ' read -ra versions <<<"$(
     IFS=','
     get_versions
   )"
diff --git a/generate-stackbrew-library.sh b/generate-stackbrew-library.sh
index d0f9d7b701..10c395c614 100755
--- a/generate-stackbrew-library.sh
+++ b/generate-stackbrew-library.sh
@@ -3,7 +3,7 @@
 set -e
 . functions.sh
 
-hash git 2> /dev/null || { echo >&2 "git not found, exiting."; }
+hash git 2>/dev/null || { echo >&2 "git not found, exiting."; }
 
 # Used dynamically: print "$array_" $1
 # shellcheck disable=SC2034
@@ -23,8 +23,8 @@ cd "$(cd "${0%/*}" && pwd -P)"
 
 self="$(basename "${BASH_SOURCE[0]}")"
 
-IFS=' ' read -ra versions <<< "$(get_versions)"
-IFS=' ' read -ra versions <<< "$(sort_versions "${versions[@]}")"
+IFS=' ' read -ra versions <<<"$(get_versions)"
+IFS=' ' read -ra versions <<<"$(sort_versions "${versions[@]}")"
 url='https://github.com/nodejs/docker-node'
 
 # get the most recent commit which modified any of "$@"
@@ -50,7 +50,7 @@ join() {
 get_stub() {
   local version="${1}"
   shift
-  IFS='/' read -ra versionparts <<< "${version}"
+  IFS='/' read -ra versionparts <<<"${version}"
   local stub
   eval stub="$(join '_' "${versionparts[@]}" | awk -F. '{ print "$array_" $1 }')"
   echo "${stub}"
@@ -65,11 +65,11 @@ for version in "${versions[@]}"; do
   fullVersion="$(get_tag "${version}" full)"
   majorMinorVersion="$(get_tag "${version}" majorminor)"
 
-  IFS=' ' read -ra versionAliases <<< "$fullVersion $majorMinorVersion $stub"
+  IFS=' ' read -ra versionAliases <<<"$fullVersion $majorMinorVersion $stub"
 
   if [ -f "${version}/Dockerfile" ]; then
     # Get supported architectures for a specific version. See details in function.sh
-    IFS=' ' read -ra supportedArches <<< "$(get_supported_arches "${version}" "default")"
+    IFS=' ' read -ra supportedArches <<<"$(get_supported_arches "${version}" "default")"
 
     echo "Tags: $(join ', ' "${versionAliases[@]}")"
     echo "Architectures: $(join ', ' "${supportedArches[@]}")"
@@ -80,7 +80,7 @@ for version in "${versions[@]}"; do
 
   # Get supported variants according to the target architecture.
   # See details in function.sh
-  IFS=' ' read -ra variants <<< "$(get_variants "$(dirname "${version}")")"
+  IFS=' ' read -ra variants <<<"$(get_variants "$(dirname "${version}")")"
   for variant in "${variants[@]}"; do
     # Skip non-docker directories
     [ -f "${version}/${variant}/Dockerfile" ] || continue
@@ -100,7 +100,7 @@ for version in "${versions[@]}"; do
 
     # Get supported architectures for a specific version and variant.
     # See details in function.sh
-    IFS=' ' read -ra supportedArches <<< "$(get_supported_arches "${version}" "${variant}")"
+    IFS=' ' read -ra supportedArches <<<"$(get_supported_arches "${version}" "${variant}")"
 
     echo "Tags: $(join ', ' "${variantAliases[@]}")"
     echo "Architectures: $(join ', ' "${supportedArches[@]}")"
diff --git a/update-keys.sh b/update-keys.sh
index 31b8b63f54..e94dc238dc 100755
--- a/update-keys.sh
+++ b/update-keys.sh
@@ -1,3 +1,3 @@
 #!/bin/sh -ex
 
-curl -fsSLo- --compressed https://github.com/nodejs/node/raw/master/README.md | awk '/^gpg --keyserver pool.sks-keyservers.net --recv-keys/ {print $NF}' > keys/node.keys
+curl -fsSLo- --compressed https://github.com/nodejs/node/raw/master/README.md | awk '/^gpg --keyserver pool.sks-keyservers.net --recv-keys/ {print $NF}' >keys/node.keys
diff --git a/update.sh b/update.sh
index 507af21a75..ffe8387062 100755
--- a/update.sh
+++ b/update.sh
@@ -3,7 +3,7 @@
 set -ue
 
 function usage() {
-  cat << EOF
+  cat <<EOF
 
   Update the node docker images.
 
@@ -30,18 +30,18 @@ EOF
 SKIP=false
 while getopts "sh" opt; do
   case "${opt}" in
-    s)
-      SKIP=true
-      shift
-      ;;
-    h)
-      usage
-      exit
-      ;;
-    \?)
-      usage
-      exit
-      ;;
+  s)
+    SKIP=true
+    shift
+    ;;
+  h)
+    usage
+    exit
+    ;;
+  \?)
+    usage
+    exit
+    ;;
   esac
 done
 
@@ -49,12 +49,12 @@ done
 
 cd "$(cd "${0%/*}" && pwd -P)"
 
-IFS=',' read -ra versions_arg <<< "${1:-}"
-IFS=',' read -ra variant_arg <<< "${2:-}"
+IFS=',' read -ra versions_arg <<<"${1:-}"
+IFS=',' read -ra variant_arg <<<"${2:-}"
 
-IFS=' ' read -ra versions <<< "$(get_versions .)"
-IFS=' ' read -ra update_versions <<< "$(get_versions . "${versions_arg[@]:-}")"
-IFS=' ' read -ra update_variants <<< "$(get_variants . "${variant_arg[@]:-}")"
+IFS=' ' read -ra versions <<<"$(get_versions .)"
+IFS=' ' read -ra update_versions <<<"$(get_versions . "${versions_arg[@]:-}")"
+IFS=' ' read -ra update_variants <<<"$(get_variants . "${variant_arg[@]:-}")"
 if [ ${#versions[@]} -eq 0 ]; then
   fatal "No valid versions found!"
 fi
@@ -150,7 +150,7 @@ function update_node_version() {
       while read -r line; do
         pattern='"\$\{'$(echo "${key_type}" | tr '[:lower:]' '[:upper:]')'_KEYS\[@\]\}"'
         sed -Ei -e "s/([ \\t]*)(${pattern})/\\1${line}${new_line}\\1\\2/" "${dockerfile}-tmp"
-      done < "keys/${key_type}.keys"
+      done <"keys/${key_type}.keys"
       sed -Ei -e "/${pattern}/d" "${dockerfile}-tmp"
     done
 
@@ -181,7 +181,7 @@ function update_node_version() {
       rm "${dockerfile}-tmp-e"
     fi
 
-    if diff -q "${dockerfile}-tmp" "${dockerfile}" > /dev/null; then
+    if diff -q "${dockerfile}-tmp" "${dockerfile}" >/dev/null; then
       echo "${dockerfile} is already up to date!"
     else
       echo "${dockerfile} updated!"
@@ -201,7 +201,7 @@ for version in "${versions[@]}"; do
 
   # Get supported variants according the target architecture
   # See details in function.sh
-  IFS=' ' read -ra variants <<< "$(get_variants "${parentpath}")"
+  IFS=' ' read -ra variants <<<"$(get_variants "${parentpath}")"
 
   if [ -f "${version}/Dockerfile" ]; then
     if [ "${update_version}" -eq 0 ]; then