diff --git a/script/binary b/script/binary
index a108aa2cd..3a3e94b61 100755
--- a/script/binary
+++ b/script/binary
@@ -4,11 +4,11 @@ set -e
 rm -f dist/traefik
 
 FLAGS=()
-if [ -n "$VERBOSE" ]; then
+if [ -n "${VERBOSE}" ]; then
     FLAGS+=(-v)
 fi
 
-if [ -z "$VERSION" ]; then
+if [ -z "${VERSION}" ]; then
     VERSION=$(git rev-parse HEAD)
 fi
 
@@ -22,6 +22,7 @@ fi
 
 # Build binaries
 # shellcheck disable=SC2086
+# shellcheck disable=SC2048
 CGO_ENABLED=0 GOGC=off go build ${FLAGS[*]} -ldflags "-s -w \
     -X github.com/traefik/traefik/v2/pkg/version.Version=$VERSION \
     -X github.com/traefik/traefik/v2/pkg/version.Codename=$CODENAME \
diff --git a/script/code-gen.sh b/script/code-gen.sh
index 7a4c9b5e6..de705c814 100755
--- a/script/code-gen.sh
+++ b/script/code-gen.sh
@@ -1,40 +1,46 @@
 #!/bin/bash -e
+# shellcheck disable=SC2046
 
 set -e -o pipefail
 
 PROJECT_MODULE="github.com/traefik/traefik"
 MODULE_VERSION="v2"
 IMAGE_NAME="kubernetes-codegen:latest"
+CURRENT_DIR="$(pwd)"
 
 echo "Building codegen Docker image..."
-docker build --build-arg KUBE_VERSION=v0.20.2 --build-arg USER=$USER --build-arg UID=$(id -u) --build-arg GID=$(id -g) -f "./script/codegen.Dockerfile" \
+docker build --build-arg KUBE_VERSION=v0.20.2 \
+             --build-arg USER="${USER}" \
+             --build-arg UID="$(id -u)" \
+             --build-arg GID="$(id -g)" \
+             -f "./script/codegen.Dockerfile" \
              -t "${IMAGE_NAME}" \
              "."
 
 echo "Generating Traefik clientSet code ..."
 cmd="/go/src/k8s.io/code-generator/generate-groups.sh all ${PROJECT_MODULE}/${MODULE_VERSION}/pkg/provider/kubernetes/crd/generated ${PROJECT_MODULE}/${MODULE_VERSION}/pkg/provider/kubernetes/crd traefik:v1alpha1 --go-header-file=/go/src/${PROJECT_MODULE}/script/boilerplate.go.tmpl"
 docker run --rm \
-           -v "$(pwd):/go/src/${PROJECT_MODULE}" \
+           -v "${CURRENT_DIR}:/go/src/${PROJECT_MODULE}" \
            -w "/go/src/${PROJECT_MODULE}" \
-           "${IMAGE_NAME}" $cmd
+           "${IMAGE_NAME}" ${cmd}
 
 echo "Generating DeepCopy code ..."
 cmd="deepcopy-gen --input-dirs ${PROJECT_MODULE}/${MODULE_VERSION}/pkg/config/dynamic --input-dirs ${PROJECT_MODULE}/${MODULE_VERSION}/pkg/tls --input-dirs ${PROJECT_MODULE}/${MODULE_VERSION}/pkg/types --output-package ${PROJECT_MODULE}/${MODULE_VERSION} -O zz_generated.deepcopy --go-header-file=/go/src/${PROJECT_MODULE}/script/boilerplate.go.tmpl"
 docker run --rm \
-           -v "$(pwd):/go/src/${PROJECT_MODULE}" \
+           -v "${CURRENT_DIR}:/go/src/${PROJECT_MODULE}" \
            -w "/go/src/${PROJECT_MODULE}" \
-           "${IMAGE_NAME}" $cmd
+           "${IMAGE_NAME}" ${cmd}
 
 echo "Generating the CRD definitions for the documentation ..."
 cmd="controller-gen crd:crdVersions=v1 paths=./pkg/provider/kubernetes/crd/traefik/v1alpha1/... output:dir=./docs/content/reference/dynamic-configuration/"
 docker run --rm \
-           -v "$(pwd):/go/src/${PROJECT_MODULE}" \
+           -v "${CURRENT_DIR}:/go/src/${PROJECT_MODULE}" \
            -w "/go/src/${PROJECT_MODULE}" \
-           "${IMAGE_NAME}" $cmd
+           "${IMAGE_NAME}" ${cmd}
 
 echo "Concatenate the CRD definitions for publication and integration tests ..."
-cat $(pwd)/docs/content/reference/dynamic-configuration/traefik.containo.us_*.yaml > $(pwd)/docs/content/reference/dynamic-configuration/kubernetes-crd-definition-v1.yml
-cp -f $(pwd)/docs/content/reference/dynamic-configuration/kubernetes-crd-definition-v1.yml $(pwd)/integration/fixtures/k8s/01-traefik-crd.yml
+cat "${CURRENT_DIR}"/docs/content/reference/dynamic-configuration/traefik.containo.us_*.yaml > "${CURRENT_DIR}"/docs/content/reference/dynamic-configuration/kubernetes-crd-definition-v1.yml
+cp -f "${CURRENT_DIR}"/docs/content/reference/dynamic-configuration/kubernetes-crd-definition-v1.yml "${CURRENT_DIR}"/integration/fixtures/k8s/01-traefik-crd.yml
 
-cp -r $(pwd)/${MODULE_VERSION}/* $(pwd)
-rm -rf $(pwd)/${MODULE_VERSION}
+cp -r "${CURRENT_DIR}/${MODULE_VERSION}"/* "${CURRENT_DIR}"
+rm -rf "${CURRENT_DIR:?}/${MODULE_VERSION}"
diff --git a/script/make.sh b/script/make.sh
index 6f670ff3b..2f3870e74 100755
--- a/script/make.sh
+++ b/script/make.sh
@@ -18,9 +18,9 @@ SCRIPT_DIR="$(cd "$(dirname "${0}")" && pwd -P)"
 
 bundle() {
     local bundle="$1"; shift
-    echo "---> Making bundle: $(basename "$bundle") (in $SCRIPT_DIR)"
+    echo "---> Making bundle: $(basename "${bundle}") (in $SCRIPT_DIR)"
     # shellcheck source=/dev/null
-    source "${SCRIPT_DIR}/$bundle"
+    source "${SCRIPT_DIR}/${bundle}"
 }
 
 if [ $# -lt 1 ]; then
@@ -28,7 +28,8 @@ if [ $# -lt 1 ]; then
 else
     bundles=${*}
 fi
+# shellcheck disable=SC2048
 for bundle in ${bundles[*]}; do
-    bundle "$bundle"
+    bundle "${bundle}"
     echo
 done
diff --git a/script/test-integration b/script/test-integration
index f6b32b6f9..13a4ab342 100755
--- a/script/test-integration
+++ b/script/test-integration
@@ -5,9 +5,9 @@ export DEST=.
 
 TESTFLAGS+=("-test.timeout=20m" -check.v)
 
-if [ -n "$VERBOSE" ]; then
+if [ -n "${VERBOSE}" ]; then
     TESTFLAGS+=(-v)
-elif [ -n "$VERBOSE_INTEGRATION" ]; then
+elif [ -n "${VERBOSE_INTEGRATION}" ]; then
     TESTFLAGS+=(-v)
 fi
 
@@ -16,4 +16,5 @@ echo "Testing against..."
 docker version
 
 # shellcheck disable=SC2086
+# shellcheck disable=SC2048
 CGO_ENABLED=0 go test -integration ${TESTFLAGS[*]}
diff --git a/script/test-unit b/script/test-unit
index 2944bab6d..8f5ef0189 100755
--- a/script/test-unit
+++ b/script/test-unit
@@ -8,15 +8,16 @@ TEXTRESET=$'\033[0m' # reset the foreground colour
 # -failfast -timeout=5m
 TESTFLAGS=(-cover "-coverprofile=cover.out" "${TESTFLAGS}")
 
-if [ -n "$VERBOSE" ]; then
+if [ -n "${VERBOSE}" ]; then
     TESTFLAGS+=(-v)
-elif [ -n "$VERBOSE_UNIT" ]; then
+elif [ -n "${VERBOSE_UNIT}" ]; then
     TESTFLAGS+=(-v)
 fi
 
 set +e
 
 # shellcheck disable=SC2086
+# shellcheck disable=SC2048
 go test ${TESTFLAGS[*]} ./pkg/...
 
 CODE=$?