I just want to highlight an easy mistake to make here. One might expect to
be able to run something like this:
exec.Command("echo", "-n", "123456", "|", "dmtxwrite", "-s", "16x48", "-o",
"image.png")
But, as you might have found, this doesn't work. This is because the pipe
"|" is an operator implemented by shells like sh and bash. As mentioned in
the overview of the os/exec package, the package never invokes your shell
automatically, so operators like the pipe operator are not available by
default. Jan's answer works because it invokes the shell explicitly to run
your command.
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