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cat-file: make the options mutually exclusive
We only parse the options if 2 or 3 arguments are specified. Update 'struct option options[]' to use OPT_CMDMODE rather than OPT_SET_INT to allow only one mutually exclusive option and avoid the need for checking number of arguments. This was written by Junio C Hamano, tested by me. Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Karthik Nayak <karthik.188@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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