Sort an attribute table of a shapefile using R rgdal

Hello,

I need to add a new field of sequential numbers to an attribute table of a shapefile. But, I need to sort the attribute table before adding the new field. I am trying to use R (rgdal) as the shapefile has over a million features. Any help or suggestion on how to sort an attribute table of a shapefile using a specific field name would be greatly appreciated.

Thank you for your time in advance.

Regards,

Ritesh

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