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The ``relenv create`` command.
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Context manager that changes to the specified directory and back.
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Raised when there is an issue creating a new relenv environment.
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Setup the subparser for the ``create`` command.
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Create a relenv environment.
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Return the site-packages directory within the created environment.
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Ensure the relenv package within the created environment matches this CLI.
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Update legacy shell-wrapped entry points to the current shebang format.
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The entrypoint into the ``relenv create`` command.
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