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 run retro and exit

RRE ("run retro and exit") is currently the default interface for
RETRO on Unix-like systems.
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Usage:

    ./rre filename

RRE will run the code in the file and then exit. It embeds the Retro
image so the only things needed are the rre binary and your code.

You can also launch RRE in interactive mode:

    ./rre -i

With interactive mode you can also specify a file to load first:

    ./rre -i -f filename
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Scripting:

RRE can be used for scripting. Start the code with a script header
like:

    #!/usr/bin/env rre

And follow this with your code.
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Source Format:

Source files should be in a Markdown variant using code blocks to
identify the code for RRE to process. Example:

    # This is a test

    Commentary will be ignored.

    ~~~
    :names (-) [ d:name puts sp ] d:for-each ;
    ~~~
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