[ubuntu] how to edit file containing routes/routing table of system

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http://ubuntuforums.org – hi all which file contains all the routes/routing table of the machine.... although i can edit routes by command line, like route add/del commands,, still how i can do it by editing the file which contans all the routes of system...what is that file name,, where placed?? i hope i can simply edit it in vim,, or is there something important to keep in mind while editing this file???? (Hardware)