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On UNIX systems, open("...|") ... returns after calling fork().

If this is true, how does open return an error if the program is not found, not executable, or has a bad shabang spec?

    perl -e 'open F, "nosuchprogram |" or die "open: $!\n"; print "don
+e\n";'
[download]

outputs:

    open: No such file or directory
[download]

I had assumed that this was because it was only returning after the exec() but I'll admit this seems to take a bit more inter-process communication.

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