diff --git a/git-release-changes.sh b/git-release-changes.sh
index 50102da..29f22ae 100755
--- a/git-release-changes.sh
+++ b/git-release-changes.sh
@@ -4,8 +4,8 @@ set -eu
 
 CURRENT=$1
 
-git log --format='%<|(21)%cn %<|(39)%cd %<|(50)%h %s' --date=format-local:'%m-%d %H:%M:%S' $CURRENT.. | \
-    grep -vF '[maven-release-plugin]' | sort | \
+git log --format='%<|(21)%cn %<|(39)%cd %<|(50)%h %s' --date=format-local:'%m-%d %H:%M:%S' "$CURRENT".. |
+    grep -vF '[maven-release-plugin]' | sort |
     awk '
 {
   name = substr($0, 1, 21)
diff --git a/trino-docker.sh b/trino-docker.sh
index 5356626..afd1abf 100755
--- a/trino-docker.sh
+++ b/trino-docker.sh
@@ -1,21 +1,22 @@
-#!/bin/sh
+#!/bin/bash
 
 set -eux
 
 VERSION=$1
-NAME=trinodb/trino
+REPO=trinodb/trino
 IMAGE=trino:$VERSION
-TARGET=$NAME:$VERSION
+TARGET=$REPO:$VERSION
 
-core/docker/build.sh -r $VERSION
+core/docker/build.sh -r "$VERSION"
 
-docker tag $IMAGE-amd64 $TARGET-amd64
-docker tag $IMAGE-arm64 $TARGET-arm64
-docker push $TARGET-amd64
-docker push $TARGET-arm64
+architectures=(amd64 arm64 ppc64le)
 
-docker manifest create $TARGET $TARGET-amd64 $TARGET-arm64
-docker manifest push --purge $TARGET
+for arch in "${architectures[@]}"; do
+    docker tag "$IMAGE-$arch" "$TARGET-$arch"
+    docker push "$TARGET-$arch"
+done
 
-docker manifest create $NAME:latest $TARGET-amd64 $TARGET-arm64
-docker manifest push --purge $NAME:latest
+for name in "$TARGET" "$REPO:latest"; do
+    docker manifest create "$name" "${architectures[@]/#/$TARGET-}"
+    docker manifest push --purge "$name"
+done
diff --git a/trino-docs.sh b/trino-docs.sh
index 5492aaf..985fc1d 100755
--- a/trino-docs.sh
+++ b/trino-docs.sh
@@ -16,21 +16,20 @@ TRACKINGID=UA-133457846-1
 AUDIENCEID=AW-1036784065
 LINKEDINID=2842796
 
-if [ -e $VERSION ]
-then
-   echo "already exists: $VERSION"
-   exit 100
+if [ -e "$VERSION" ]; then
+    echo "already exists: $VERSION"
+    exit 100
 fi
 
 mvn org.apache.maven.plugins:maven-dependency-plugin:2.8:get \
-  -Dartifact=$GROUP:$ARTIFACT:$VERSION:zip -DremoteRepositories=$CENTRAL
+    -Dartifact=$GROUP:$ARTIFACT:$VERSION:zip -DremoteRepositories=$CENTRAL
 
-unzip $REPOSITORY/$GROUPDIR/$ARTIFACT/$VERSION/$ARTIFACT-$VERSION.zip
+unzip "$REPOSITORY/$GROUPDIR/$ARTIFACT/$VERSION/$ARTIFACT-$VERSION.zip"
 
-mv html $VERSION
+mv html "$VERSION"
 
-find -H $VERSION -type f -name '*.html' -print0 | xargs -0 perl -pi -e \
-"s@</head>
+find -H "$VERSION" -type f -name '*.html' -print0 | xargs -0 perl -pi -e \
+    "s@</head>
 @  <script async src=\"https://www.googletagmanager.com/gtag/js?id=$TRACKINGID\"></script>
     <script>
       window.dataLayer = window.dataLayer || [];
@@ -60,7 +59,7 @@ s@</header>@</header>@;
 s@<a href=\"[^\"]*\" title=\"Trino $VERSION Documentation\"@<a href=\"/\" title=\"Trino\"@;
 "
 
-cat <<EOT >> $VERSION/_static/trino.css
+cat <<EOT >>$VERSION/_static/trino.css
 
 .md-sidebar { padding-block-start: 75px; }
 .md-content { padding-block-start: 50px; }
@@ -105,9 +104,9 @@ header.md-header { top: 53px; }
 }
 EOT
 
-echo "/current/* /$VERSION/:splat 200" > _redirects
-/bin/ln -sfh $VERSION current
+echo "/current/* /$VERSION/:splat 200" >_redirects
+/bin/ln -sfh "$VERSION" current
 
-git add $VERSION _redirects current
+git add "$VERSION" _redirects current
 
 git commit -m "Add $VERSION docs"
diff --git a/trino-site.sh b/trino-site.sh
index 22b3476..772af13 100755
--- a/trino-site.sh
+++ b/trino-site.sh
@@ -4,7 +4,7 @@ set -eu
 
 VERSION=$1
 
-perl -pi -e 's/trino_version: \d+/trino_version: '$VERSION'/g' _config.yml
+perl -pi -e 's/trino_version: \d+/trino_version: '"$VERSION"'/g' _config.yml
 
 git add _config.yml