Ejecución en línea de comandos

The shell supports several options to control verbosity, ANSI coloring and other features:

casiano@millo:~/src/groovy$ groovysh --help
usage: groovysh [options] [...]
  -C, --color[=FLAG]         Enable or disable use of ANSI colors
  -D, --define=NAME=VALUE    Define a system property
  -T, --terminal=TYPE        Specify the terminal TYPE to use
  -V, --version              Display the version
  -d, --debug                Enable debug output
  -h, --help                 Display this help message
  -q, --quiet                Suppress superfluous output
  -v, --verbose              Enable verbose output

In addition to options, commands or expressions can be given on the command-line which will invoke the shell in non-interactive mode. The commands or expressions will be evaluated and the shell will exit. If no additional arguments are given the shell will startup interactively.

Sigue un ejemplo de ejecución de un comando:

casiano@millo:~/src/groovy$ groovysh 'show preferences'
No preferences are set

Sigue un ejemplo de evaluación de una expresión:

casiano@tonga:~/src/groovy$ groovysh 'System.properties.each { k, v -> println("$k = $v") }'
java.runtime.name = OpenJDK  Runtime Environment
sun.boot.library.path = /usr/lib/jvm/java-6-openjdks/jre/lib/i386
java.vm.version = 1.6.0_0-b11
java.vm.vendor = Sun Microsystems Inc.
java.vendor.url = http://java.sun.com/
path.separator = :
java.vm.name = OpenJDK Client VM
file.encoding.pkg = sun.io
sun.java.launcher = SUN_STANDARD
user.country = US
sun.os.patch.level = unknown
program.name = groovysh
java.vm.specification.name = Java Virtual Machine Specification
user.dir = /home/casiano/src/groovy
java.runtime.version = 1.6.0_0-b11
java.awt.graphicsenv = sun.awt.X11GraphicsEnvironment
java.endorsed.dirs = /usr/lib/jvm/java-6-openjdks/jre/lib/endorsed
os.arch = i386
javax.accessibility.assistive_technologies = org.GNOME.Accessibility.JavaBridge
java.io.tmpdir = /tmp
line.separator = 
.....