Replace space with empty

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http://www.unix.com – Hi All, My Input is: Code: 111.121 23212121 121.231 12678878 My output should be Code: 111.12123212121 121.23112678878 in each row i need to replace that perticular space with empty. 8th position in the file for all rows. Please help me in this case .. Thanks (HowTos)