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in this video were going to write a program in c to replace a specific line of text in a file so for example if we have a file like this with five lines of text in it the program should ask the user for the line number to replace and maybe the user picks line number three the program should also ask the user for the replacement text and maybe the user enters abcdefg after the program is run file.txt should be the same except for line three it should be replaced with the text abcdefg so the way were going to solve this problem is were actually going to have our program create a temporary file and were going to write each line of the original file into that temporary file except for the line number where the user wants to replace the text for that line were going to write in the replacement text instead then well delete the original file and well rename the temporary file to have the original file name from the perspective of the user the text in that file will have been replaced