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copied!<p>I'm not sure why this happens on Ubuntu and not on OS X, but one possibile work-around on Ubuntu may be to decorate the writer with your own class which appends the written characters to the StringBuffer. </p> <p>It not <em>very</em> pretty, since you will have to add OS specific code to make sure that the output is not included twice on OS X.</p> <p>Anyway, here is the script in full with the decorator class, which works fine for me on Ubuntu 12.04 using Groovy 2.0.5.</p> <pre><code>import groovy.io.GroovyPrintWriter def OUTPUT_FILE = "output.txt" def sysout = new StringBuffer() def syserr = new StringBuffer() // On Linux (Ubuntu 12.04) - starts the bc command with script and capture session to OUTPUT_FILE Process proc = "script -q -f -c bc ${OUTPUT_FILE}".execute() // On OS X with a slightly different version of Script // Process proc = "script -q ${OUTPUT_FILE} bc".execute() proc.consumeProcessOutput(sysout, syserr) // Spawns separate threads that will consume the out to prevent overflow proc.withWriter { writer -> // Writes the following commands to the spawned process def gWriter = new GroovyPrintWriter(new MyCaptureWriter(writer, sysout)) // Imagine that the user enters these lines gWriter.println "a = 5" gWriter.println "b = 4" gWriter.println "c = a * b" gWriter.println "c" gWriter.println "quit" } proc.waitForOrKill(20000) // Give it 20 seconds to complete or kill the process println 'Standard out captured from process:\n' + sysout println 'Standard err captured from process:\n' + syserr class MyCaptureWriter extends Writer { @Delegate OutputStreamWriter writer def sysout MyCaptureWriter(writer, sysout) { this.writer = writer this.sysout = sysout } @Override void write(char[] cbuf, int off, int len) throws IOException { sysout.append(cbuf, off, len) writer.write(cbuf, off, len) } } </code></pre>

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