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dd, which doesn't show up under bash. What shell do you use?catreplacingunzip(I don't have Zip archives) inbashnorzshon OpenBSD using either of GNUddor OpenBSDdd. Did you originally have a space before the process substitution? That would make GNUddcomplain as you show.$ echo if=<(:)producesif= /dev/fd/4(with a rogue leading space). ARGH!