Preserving file format and spacing in output file

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http://www.unix.com – Hi I have a file with the following structure Code: "VATTENFALL GLOBAL"                        "Vattenfall Tray"  "BARCLAYS BANK LONDON"                  "Capula"                      "P1 AGEAS GLOBAL COMPANY"              "AAC - Optiver" The requirement is like this 1) Take 2 input from user, 1st the string to replace and 2 (HowTos)