jrunscript

Runs a command-line script shell that supports interactive and batch modes. This command is experimental and unsupported.

Synopsis

jrunscript [options] [arguments]

options

Description

The jrunscript command is a language-independent command-line script shell. The jrunscript command supports both an interactive (read-eval-print) mode and a batch (-f option) mode of script execution. By default, JavaScript is the language used, but the -l option can be used to specify a different language. By using Java to scripting language communication, the jrunscript command supports an exploratory programming style.

Options

-classpath path: Indicate where any class files are that the script needs to access.
-cp path: Same as -classpath path..
-Dname=value: Sets a Java system property.
-Jflag: Passes flag directly to the Java Virtual Machine where the jrunscript command is running.
-I language: Uses the specified scripting language. By default, JavaScript is used. To use other scripting languages, you must specify the corresponding script engine's JAR file with the -cp or -classpath option.
-e script: Evaluates the specified script. This option can be used to run one-line scripts that are specified completely on the command line.
-encoding encoding: Specifies the character encoding used to read script files.
-f script-file: Evaluates the specified script file (batch mode).
-f -: Reads and evaluates a script from standard input (interactive mode).
-help: Displays a help message and exits.
-?: Displays a help message and exits.
-q: Lists all script engines available and exits.

Arguments

If arguments are present and if no -e or -f option is used, then the first argument is the script file and the rest of the arguments, if any, are passed to the script. If arguments and -e or the -f option are used, then all arguments are passed to the script. If arguments, -e and -f are missing, then interactive mode is used. Script arguments are available to a script in an engine variable named arguments of type String array.

Examples

Execute Inline Scripts

jrunscript -e "print('hello world')"
jrunscript -e "cat('http://www.example.com')"

Use Specified Language and Evaluate the Script File

jrunscript -l js -f test.js

Interactive Mode

jrunscript
js> print('Hello World\n');
Hello World
js> 34 + 55
89.0
js> t = new java.lang.Thread(function() { print('Hello World\n'); })
Thread[Thread-0,5,main]
js> t.start()
js> Hello World
 
js>

Run Script File with Script Arguments

The test.js file is the script file. The arg1, arg2 and arg3 arguments are passed to the script. The script can access these arguments with an arguments array.

jrunscript test.js arg1 arg2 arg3