diff --git a/meta/recipes-connectivity/openssl/files/environment.d-openssl.sh b/meta/recipes-connectivity/openssl/files/environment.d-openssl.sh
index c635be8acab3..d989a2279183 100644
--- a/meta/recipes-connectivity/openssl/files/environment.d-openssl.sh
+++ b/meta/recipes-connectivity/openssl/files/environment.d-openssl.sh
@@ -4,16 +4,16 @@ export OPENSSL_ENGINES="$OECORE_NATIVE_SYSROOT/usr/lib/engines-3"
 
 # Respect host env SSL_CERT_FILE/SSL_CERT_DIR first, then auto-detected host cert, then cert in buildtools
 # CAFILE/CAPATH is auto-deteced when source buildtools
-if [ -z "$SSL_CERT_FILE" ]; then
-   if [ -n "$CAFILE" ];then
+if [ -z "${SSL_CERT_FILE:-}" ]; then
+   if [ -n "${CAFILE:-}" ];then
        export SSL_CERT_FILE="$CAFILE"
    elif [ -e "${OECORE_NATIVE_SYSROOT}/etc/ssl/certs/ca-certificates.crt" ];then
        export SSL_CERT_FILE="$OECORE_NATIVE_SYSROOT/usr/lib/ssl/certs/ca-certificates.crt"
    fi
 fi
 
-if [ -z "$SSL_CERT_DIR" ]; then
-   if [ -n "$CAPATH" ];then
+if [ -z "${SSL_CERT_DIR:-}" ]; then
+   if [ -n "${CAPATH:-}" ];then
        export SSL_CERT_DIR="$CAPATH"
    elif [ -e "${OECORE_NATIVE_SYSROOT}/etc/ssl/certs/ca-certificates.crt" ];then
        export SSL_CERT_DIR="$OECORE_NATIVE_SYSROOT/usr/lib/ssl/certs"
diff --git a/meta/recipes-devtools/git/git/environment.d-git.sh b/meta/recipes-devtools/git/git/environment.d-git.sh
index 9c7b5a92512a..fdfa721c3b2e 100644
--- a/meta/recipes-devtools/git/git/environment.d-git.sh
+++ b/meta/recipes-devtools/git/git/environment.d-git.sh
@@ -1,15 +1,15 @@
 # Respect host env GIT_SSL_CAINFO/GIT_SSL_CAPATH first, then auto-detected host cert, then cert in buildtools
 # CAFILE/CAPATH is auto-deteced when source buildtools
-if [ -z "$GIT_SSL_CAINFO" ]; then
-	if [ -n "$CAFILE" ];then
+if [ -z "${GIT_SSL_CAINFO:-}" ]; then
+	if [ -n "${CAFILE:-}" ];then
 		export GIT_SSL_CAINFO="$CAFILE"
 	elif [ -e "${OECORE_NATIVE_SYSROOT}/etc/ssl/certs/ca-certificates.crt" ];then
 		export GIT_SSL_CAINFO="${OECORE_NATIVE_SYSROOT}/etc/ssl/certs/ca-certificates.crt"
 	fi
 fi
 
-if [ -z "$GIT_SSL_CAPATH" ]; then
-	if [ -n "$CAPATH" ];then
+if [ -z "${GIT_SSL_CAPATH:-}" ]; then
+	if [ -n "${CAPATH:-}" ];then
 		export GIT_SSL_CAPATH="$CAPATH"
 	elif [ -e "${OECORE_NATIVE_SYSROOT}/etc/ssl/certs/ca-certificates.crt" ];then
 		export GIT_SSL_CAPATH="${OECORE_NATIVE_SYSROOT}/etc/ssl/certs"
diff --git a/meta/recipes-devtools/python/python3-requests/environment.d-python3-requests.sh b/meta/recipes-devtools/python/python3-requests/environment.d-python3-requests.sh
index 492177a9c377..400972814b6e 100644
--- a/meta/recipes-devtools/python/python3-requests/environment.d-python3-requests.sh
+++ b/meta/recipes-devtools/python/python3-requests/environment.d-python3-requests.sh
@@ -1,7 +1,7 @@
 # Respect host env REQUESTS_CA_BUNDLE first, then auto-detected host cert, then cert in buildtools
 # CAFILE/CAPATH is auto-deteced when source buildtools
-if [ -z "$REQUESTS_CA_BUNDLE" ]; then
-	if [ -n "$CAFILE" ];then
+if [ -z "${REQUESTS_CA_BUNDLE:-}" ]; then
+	if [ -n "${CAFILE:-}" ];then
 		export REQUESTS_CA_BUNDLE="$CAFILE"
 	elif [ -e "${OECORE_NATIVE_SYSROOT}/etc/ssl/certs/ca-certificates.crt" ];then
 		export REQUESTS_CA_BUNDLE="${OECORE_NATIVE_SYSROOT}/etc/ssl/certs/ca-certificates.crt"
diff --git a/meta/recipes-support/curl/curl/environment.d-curl.sh b/meta/recipes-support/curl/curl/environment.d-curl.sh
index 7c2971b3dad1..581108ef35d8 100644
--- a/meta/recipes-support/curl/curl/environment.d-curl.sh
+++ b/meta/recipes-support/curl/curl/environment.d-curl.sh
@@ -1,15 +1,15 @@
 # Respect host env CURL_CA_BUNDLE/CURL_CA_PATH first, then auto-detected host cert, then cert in buildtools
 # CAFILE/CAPATH is auto-deteced when source buildtools
-if [ -z "$CURL_CA_PATH" ]; then
-	if [ -n "$CAFILE" ];then
+if [ -z "${CURL_CA_PATH:-}" ]; then
+	if [ -n "${CAFILE:-}" ];then
 		export CURL_CA_BUNDLE="$CAFILE"
 	elif [ -e "${OECORE_NATIVE_SYSROOT}/etc/ssl/certs/ca-certificates.crt" ];then
 		export CURL_CA_BUNDLE="${OECORE_NATIVE_SYSROOT}/etc/ssl/certs/ca-certificates.crt"
 	fi
 fi
 
-if [ -z "$CURL_CA_PATH" ]; then
-	if [ -n "$CAPATH" ];then
+if [ -z "${CURL_CA_PATH:-}" ]; then
+	if [ -n "${CAPATH:-}" ];then
 		export CURL_CA_PATH="$CAPATH"
 	elif [ -e "${OECORE_NATIVE_SYSROOT}/etc/ssl/certs/ca-certificates.crt" ];then
 		export CURL_CA_PATH="${OECORE_NATIVE_SYSROOT}/etc/ssl/certs"