$ qrc -h
Usage: qrc [options] [text]
If text is not given as an argument, input is taken from stdin until EOF.
Options:
-e string
error correction level: L, M, Q, or H (default "L")
-o string
output file (default "-")
Example usage (assuming you have ImageMagick's display installed):
$ some-command | qrc | display
qrc uses rsc/qr internally and only produces PNG images.