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ant.condition(property: "os", value: "windows") { os(family: "windows") }
ant.condition(property: "os", value: "unix" ) { os(family: "unix") }

task execCommandLine(type:Exec) {
    switch(ant.properties.os){
        case 'windows':
            commandLine 'cmd', '/c', 'echo', 'hello'
            break
        case 'unix':
            commandLine 'echo', 'hello'

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class Greeting implements Plugin<Project> {
    void apply(Project target) {
        def helloTask = target.task('hello', type: HelloTask)
        helloTask .group = 'greeting'
        helloTask .description = 'Say hello.'
        target.task('hi', type: HiTask){
            group = 'greeting'
            description = 'Say hi.'
        }
    }

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task hello << {
    println 'hello'
}
hello.group = 'greeting'
hello.description = 'Say hello.'

task hi << {
    println 'hi'
}
hi.group = 'greeting'

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// the contents of .gradle/other.gradle is:
//   ext.prop1 = 'value1'
apply from: "${System.properties['user.home']}/.gradle/other.gradle"

task testProperties << {
    println project.prop1
}

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apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'maven'

dependencies { compile 'commons-lang:commons-lang:2.6' }

repositories {
    mavenCentral()
}

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ant.condition(property: "os", value: "windows") { os(family: "windows") }
ant.condition(property: "os", value: "unix"   ) { os(family: "unix")    }

task typeos << {
    switch(ant.properties.os){
        case 'windows':
            println 'This is windows.'
            break
        case 'unix':
            println 'This is unix.'

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apply plugin: 'eclipse'
apply plugin: 'maven'

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies { 
        classpath 'org.apache.commons:commons-email:1.2'
    }

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defaultTasks 'checkProperty'

task checkProperty << {
    println hasProperty('test')
    println project.hasProperty('test')
}

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apply plugin: 'eclipse'
apply plugin: 'maven'
apply plugin: 'greeting'

buildscript {
    repositories { mavenLocal() }
    dependencies { classpath 'com.example:greet:1.0-SNAPSHOT' }
}

task hi(type:com.example.GreetingTask){

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apply plugin: 'groovy'
apply plugin: 'eclipse'
apply plugin: 'maven'

group = 'com.example'
archivesBaseName = 'greet'
version = '1.0-SNAPSHOT'

dependencies {
    compile gradleApi()