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HOW TO INSERT STRING INTO TOP OF FILE?

Posted on 1998-09-08
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Last Modified: 2010-04-15
HOW TO INSERT STRING INTO TOP OF FILE?(EXAMPLE CODE)
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Question by:tanad
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alexo earned 20 total points
ID: 1252552
Due to the workings of most file systems insertions to a file are impossible.
You should create a new file, write the string to it, append the old file to the new, delete the old and rename the new.
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by:jkrautner
ID: 1252553
Well, I think you have only 2 choices.
1. Write your string in a new file, and then also programmaticaly
   read the old file and write every record into the new file.
or
2. Write your string in a new file, and now spawn a DOS copy
   to append both files together.
   i.e. system("copy string.txt+oldfile.txt new.txt");
 

I think the easiest way is to write your string into a file
and then spawn the copy command to append the old file to
the file
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by:braveheart
ID: 1252554
It is always helpful to say what operating system you are using.
If you are using UNIX you don't need to use C:

echo "string" > newfile
cat oldfile >> newfile
mv newfile oldfile

This writes the string to the top of a new file and then concatenates the original file to the end of the new file. Finally it renames the new file to have the same name as the original file.
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Expert Comment

by:jhurst
ID: 1252555
actually if you are using dos you can do the same thing as unix, just:
echo "string" >newfile
type oldfile >>newfile
move /y newfile oldfile
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