diff --git a/scripts/show_toolchains.sh b/scripts/show_toolchains.sh
index bdec2927..7cfc2960 100755
--- a/scripts/show_toolchains.sh
+++ b/scripts/show_toolchains.sh
@@ -7,7 +7,7 @@ toolchain_by_config() {
   FMT=$2
 
   BR2_VER=$(grep BR2_DEFAULT_KERNEL_VERSION $CF)
-  if [ ! -z $BR2_VER ]; then
+  if [ -n "$BR2_VER" ]; then
     VENDOR=$(echo $CF | cut -d - -f 4 | cut -d / -f 1 | sed -r 's/\<./\U&/g')
     KVER=$(echo $BR2_VER | cut -d \" -f 2 | awk -F . '{printf "%s_%s", $1, $2}')
     GCC_VER=$(sed -rn "s/^BR2_GCC_VERSION_([0-9]*)_X=y/\1/p" $CF)
@@ -26,10 +26,10 @@ toolchain_by_config() {
       ARCH=$(sed -rn "s/^BR2_(mips_[a-z]*)=y/\1/p" $CF)
     else
       THUMB=$(sed -rn "s/^BR2_ARM_INSTRUCTIONS_(THUMB2)=y/\1/p" $CF)
-      if [ ! -z "$THUMB" ]; then
+      if [ -n "$THUMB" ]; then
         ARCH="${ARCH}_${THUMB,,}"
       fi
-      if [ ! -z "$HF" ]; then
+      if [ -n "$HF" ]; then
         ARCH="${ARCH}_${HF}"
       fi
     fi
@@ -45,7 +45,7 @@ toolchain_by_config() {
         echo $ARCH $GCC_VER $LIBC $KVER
         ;;
       *)
-        if [ ! -z "$2" ]; then
+        if [ -n "$2" ]; then
           BR_DIR=buildroot-$2
           GCC_VER=$(sed -rn \
             "s/^\s+default\s+\"([0-9.]+)\"\s+if BR2_GCC_VERSION_${GCC_VER}_X/\1/p" \