$ ./gradlew clean build -x test
$ ./gradlew bootRun
$ ./gradlew :bootcloud-eureka:bootRun
$ mkdir /opt/gradle
$ unzip -d /opt/gradle gradle-4.1-bin.zip
$ ls /opt/gradle/gradle-4.1
LICENSE NOTICE bin getting-started.html init.d lib media
$ export PATH=$PATH:/opt/gradle/gradle-4.1/bin
$ gradle -v
$ ./gradlew wrapper --gradle-version=4.1 --distribution-type=bin
$ mkdir java-demo
$ cd java-demo
$ gradle init --type java-application
$ ./gradlew build -x test
$ ./gradlew run
$ ./gradlew tasks
$ gradle init wrapper