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how to merge multiple rows into single row if first column matches ?

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linux-howto

http://www.unix.com – Hi, Can anyone suggest quick way to get desired output? Sample input file content: A 12 9 A -0.3 2.3 B 1.0 -4 C 34 1000 C -111 900 C 99 0.09 Output required: A 12 9 -0.3 2.3 B 1.0 -4 C 34 1000 -111 900 99 0.09 Thanks (HowTos)