>FYI: I've added a -b(ackup) flag to install(1) to move any existing
>file(s) aside by renaming them to file.old instead of simply deleting
>them. A different backup suffix may be chosen with the -B option's
>argument.

what about something more vmslike^H^H^Hgnulike^H^H^Hnumeric so that
you can keep multiple backups?

eg .0 .1 .2 ...

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