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  • 1
    What was the indication that your first command had actually filled up the disk? Commented Mar 6, 2019 at 7:33
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    @Kusalananda It was reported by df. I was monitoring it from another virtual terminal using watch df -h Commented Mar 6, 2019 at 7:40
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    @Kusalananda: you can test this easily with strace strings /dev/urandom > /dev/full Commented Mar 6, 2019 at 9:39
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    @mosvy OpenBSD uses that same strings implementation from GNU binutils. I was referring to the strace command. Commented Mar 6, 2019 at 19:48
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    @Kusalananda OK, because the "BSD toolchain" replacement of strings(1) doesn't check for the return value of putchar() either Commented Mar 6, 2019 at 20:15