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Editorial Team
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Asked: 2026-06-05T07:08:05+00:00

You can use dd if=/dev/zero of=file count=1024 bs=1024 to zero fill a file. Instead

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You can use

dd if=/dev/zero of=file count=1024 bs=1024

to zero fill a file.

Instead of that I want to one fill a file. How do I do that?

There is no /dev/one file, so how can I simulate that effect via on bash shell?

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  1. Editorial Team

    Try this:

    dd if=<(yes $'\01' | tr -d "\n") of=file count=1024 bs=1024

    Substitute $'\377' or $'\xFF' if you want all the bits to be ones.

    MacOS tr may complain about "Illegal byte sequence". Setting LC_CTYPE=C will prevent that. This version can also be used in Linux:

    dd if=<(yes $'\01' | LC_CTYPE=C tr -d "\n") of=file count=1024 bs=1024
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