capture process output in Groovy

You can also do

Process pngquantCmd = imgCommand.execute();
def output= pngquantCmd.text;
println("Output : " + output);

Instead of

    pngquantCmd.consumeProcessOutput(System.out, System.err)

Which will start a couple of threads to read the outputs and plough on regardless of the process' situation, you should try

    pngquantCmd.waitForProcessOutput(System.out, System.err)

Which will redirect the process output and then wait for it to finish before moving on :-)

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