Friday September 16, 2005
Mustang (Java SE 6) includes (build 51 onwards) jrunscript - a command line scripting shell. This is under $JDK/bin directory. This shell supports script execution both batch and interactive modes. You can choose the scripting language by -l option and list all the available script engines by -q option. The default scripting language is JavaScript.
The usage message of jrunscript looks like:
Usage: jrunscript [options] [arguments...]
where [options] include:
-classpath <path> Specify where to find user class files
-cp <path> Specify where to find user class files
-D<name>=<value> Set a system property
-J<flag> Pass <flag> directly to the runtime system
-l <language> Use specified scripting language
-e <script> Evaluate given script
-encoding <encoding> Specify character encoding used by script files
-f <script file> Evaluate given script file
-f - Interactive mode, read script from standard input
If this is used, this should be the last -f option
-help Print this usage message and exit
-? Print this usage message and exit
-q List all scripting engines available and exit
If [arguments..] are present and if no -e or -f option is used, then first
argument is script file and the rest of the arguments, if any, are passed
as script arguments. If [arguments..] and -e or -f option is used, then all
[arguments..] are passed as script arguments. If [arguments..], -e, -f are
missing, then interactive mode is used.
You can easily test your script one liners by -e option. For example,
jrunscript -e "print('hello world')"
jrunscript supports interactive mode. Because of Java-JavaScript integration in Rhino JavaScript engine, interactive mode is a great way to learn Java APIs in Mustang. Nothing like writing few lines of code to learn new API. With jrunscript you can do that just by writing few lines of script!!
