Simplify shell in build.gradle

build.gradle

@@ -116,13 +116,11 @@ def await(Process proc) {
 }
 
 def shell(String command) {
-    def proc
     if (operatingSystem == "unix") {
-        proc = ['bash', '-c', command].execute()
+        return ['bash', '-c', command].execute()
     } else {
-        proc = ["cmd", "/c", command].execute()
+        return ["cmd", "/c", command].execute()
     }
-    return proc
 }
 
 def serverStart(String serverName) {