How do I merge multiple columns into one column?

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http://www.unix.com – Hi all, I'm looking for a way to merge multiple columns (from one file) into a single column in an output file. The file I have looks somewhat like this: Code: @HWI-ST212        1:N:0        AGTCCTACCGGGAGT        +        @@@DDDDDHHHHHII @HWI-ST212        1:N:0        CGTTTAAAAATTTCT        +        @;@B;DDDDH?:F;F @HWI-ST212        1:N:0        TCGGAGATTCCGTAC      (HowTos)