inserting into a file

[Larry Bates]

Sai Krishna M wrote:
> I want to insert a string in a file after a particular line.
> 
> I thought of using seek() function but on opening the file in append
> mode the seek value is undone.
> One crude idea i had was to read the file in a list and insert the
> string correspondingly.
> 
> Is there any other way to do this?
> Please help...
> 
> Sai krishna M
No "magic" way to insert lines.  If file is small, read into
memory, insert line, write to disk.  If it is large, read and
write lines to secondary file, insert line, read remaining lines,
delete old file and rename to new file.

-Larry Bates