How can I insert/remove a word in the middle of a text file?

How开发者_Go百科 can I insert or remove a word in the middle of a text file using C on Linux?

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Copy the whole file to a temporary location by adding/omitting the word to remove, replace the original source by the temporary file.

There's also the possiblity to use fseek() http://www.manpagez.com/man/3/fseek/