Use syntax in gradlew

Signed-off-by: Judy Ng <[email protected]>

api/gradlew

@@ -21,27 +21,26 @@
 ##  Gradle start up script for UN*X
 ##
 ##############################################################################
-
 # Attempt to set APP_HOME
 # Resolve links: $0 may be a link
 PRG="$0"
 # Need this for relative symlinks.
 while [ -h "$PRG" ] ; do
-    ls=`ls -ld "$PRG"`
-    link=`expr "$ls" : '.*-> \(.*\)$'`
+    ls=$(ls -ld "$PRG")
+    link=$(expr "$ls" : '.*-> \(.*\)$')
     if expr "$link" : '/.*' > /dev/null; then
         PRG="$link"
     else
-        PRG=`dirname "$PRG"`"/$link"
+        PRG=$(dirname "$PRG")"/$link"
     fi
 done
-SAVED="`pwd`"
-cd "`dirname \"$PRG\"`/" >/dev/null || exit
-APP_HOME="`pwd -P`"
+SAVED="$(pwd)"
+cd "$(dirname "$PRG")/" >/dev/null || exit
+APP_HOME="$(pwd -P)"
 cd "$SAVED" >/dev/null || exit
 
 APP_NAME="Gradle"
-APP_BASE_NAME=`basename "$0"`
+APP_BASE_NAME=$(basename "$0")
 
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
 DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
@@ -65,7 +64,7 @@ cygwin=false
 msys=false
 darwin=false
 nonstop=false
-case "`uname`" in
+case "$(uname)" in
   CYGWIN* )
     cygwin=true
     ;;
@@ -178,7 +177,7 @@ save () {
     for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
     echo " "
 }
-APP_ARGS=`save "$@"`
+APP_ARGS=$(save "$@")
 
 # Collect all arguments for the java command, following the shell quoting and substitution rules
 eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"