Dear All,

I need to add a header of one line to an already existing file.
I know that it can be achieved by the following:

echo "Header" > newfile
cat file1 >> newfile

But my problem is that file is huge and there is no space for creating a new file every time. Is there a way that I can add header without creating a new file?

Thanks
Shash

Thanks for the reply sysgate. But, I don't want to create a new file.
Is there a way I can add the header in the existing file itself.

Thanks
Shash

If this is something you will need to do repeatedly, I suppose you could try something with an ex script. If you had something like this in a file named addhdr:
And you would run it like this:

Thanks Vi-Curious!. It works for a small file. But I'm encountering an error stating Tmp file too large
while carrying out for a much bigger file.

Thanks
Shash

Ok, so your file is too large. We need to use a "large file" safe editor. Switch from ex to ed and modify the end of the command file.

File addhdr_ed
Execute as before, but using ed: