This would add a powerful use case where one could feed glabels-3-batch with CSV data on the input, use a template, and pipe the resulting PDF to lp for immediate printing.

Currently this is possible with a sleight of hand: the /dev/stdout file can be set as output file, but the stdout will also be used for writing LABEL FILE = test.glabels.

Is the LABEL FILE output useful to anyone?

Todos:

• support the glabels-3-batch -o - shorthand to signify stdout as the output pdf file
• clean up any use of diagnostic writes onto the stdout, and use stderr instead