# Picocli in Groovy Scripts This module contains classes to allow the use of picocli annotations in Groovy scripts. This module was introduced in picocli 4.0; in previous versions these classes were included in the main `picocli-$version` artifact. ## Example ```groovy @Grab('info.picocli:picocli-groovy:4.6.1') @Command(description = "Print a checksum of each specified FILE.", mixinStandardHelpOptions = true, version = 'checksum v1.2.3', showDefaultValues = true) @picocli.groovy.PicocliScript import groovy.transform.Field import java.security.MessageDigest import static picocli.CommandLine.* @Parameters(arity="1", paramLabel="FILE", description="The file(s) whose checksum to calculate.") @Field private File[] files @Option(names = ["-a", "--algorithm"], description = [ "MD2, MD5, SHA-1, SHA-256, SHA-384, SHA-512, or", " any other MessageDigest algorithm."]) @Field private String algorithm = "MD5" files.each { println MessageDigest.getInstance(algorithm).digest(it.bytes).encodeHex().toString() + "\t" + it } ``` See the [Groovy Scripts on Steroids](https://picocli.info/picocli-2.0-groovy-scripts-on-steroids.html) article for more details.