Some tasks simply do some processing, output their results, and finish executing. You may want to interact with the user or create a long-running that can be controlled by user input (See the snake game)

Use these methods made available to interact with your users


The ask() task will wait for the to enter any amount of text until a line break is entered. A message must be supplied that lets the user what you'd like to receive from them. The task will return their response in a string variable.

var favoriteColor = ask( 'WHAT, is your favorite color??' );

if( favoriteColor == 'red' ) {
    print.boldRedLine( 'AAAAHHHHHH!!!!' );
} else if ( favoriteColor == 'I mean blue' ) {
    print.line( 'Obscure Monty Python reference' );

You can mask sensitive input so it doesn't show on the screen:

response = ask( message='What is your password?', mask='*' );

You can also put default text in the buffer for a wizard-style interface where the user can simply hit "enter" to accept the visible default values.

response = ask( message='Enter installation Directory: ', defaultResponse='/etc/foo/bar` );


If you just need a single character collected from a user, or perhaps any keystroke at all, use the waitForKey() method. A message must be supplied that lets the user know what you need. The ASCII code representing the character they enter will be returned in a string variable.

var ASCIICode = waitForKey( 'Press any key, any key.' );
print.line().line( 'My magic tells me you pressed: #Chr( ASCIICode )#' );

Note It is a known behavior that multi-byte characters such as the up arrow will only return the first byte which kind of makes them useless. We have logged a bug in the Java project that handles the low-level shell.


If you want to ask the user a yes or no question, use the confirm() method. Any boolean that evaluates to true or a y will return true. Everything else will return false. This allows your users to respond with what's natural to them like yes, y, no, n, true, or false. You must pass a question into the method and you will receive a boolean back.

if( confirm( 'Do you like Pizza? [y/n]' ) ) {
    print.greenLine( 'Good for you.' );
} else {
    print.boldRedLine( 'Heretic!!' );


Remember that while interactivity is cool, people might want to automate your tasks as part of a script that runs headlessly. Therefore you should always provide a way to skip prompts if possible.

function run( required path, Boolean force=false )  {
    if( arguments.force || confirm( "Are you sure? [y/n]" ) ) {
        fileDelete( arguments.path );
        print.redLine( "It's gone, baby." );
    print.redLine( "Chickened out!" );

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