find, replace and save string in ascii file

[peter]

Thank you for your advice.

I'm not so good in python yet, so could you be so kind and write me a
piece of code for the part

 If you want the output to be written to same file just 'move' this
 temperory file to the input file once you are done.

Because that's what I don't know how to do it. How to replace a string
in the middle of the file and than save this file.

Thanks a lot.


Amit Khemka wrote:
> On 23 Aug 2006 05:48:37 -0700, peter <borique at gmail.com> wrote:
> > Hello all,
> >
> > I'm looking for an advice.
> >
> > Example (one block in ascii file):
> > $------------------------
> > NAME='ALFA'
> > CODE='x'
> > $------------------------
> >
> > There are many similar blocks in the file with different NAMEs and
> > different CODEs. What I'm looking for is a script that searchs through
> > whole file and finds all strings with name ALFA and based on what CODE
> > is after each ALFA (can be x, y or z) the ALFA name is replaced by
> > BETAx,BETAy or BETAz and so changed file saves.
> >
> > What I did is that I can find all strings which I need, next I change
> > these strings based on CODE, but what I can't is to replace old string
> > with new one, on the same position in the file. It always writes new
> > string at the end of the file. Here is my code....
>
> A simpler way can be:
>
> 1. Read a 'block' from the input file, ( you can simply read a line
> starting with 'NAME' and keep on reading till you find a line with
> starting 'CODE')
> 2. Once you have read a 'block', make whatever you want changes to the
> NAME and then write the 'block' to a temperory file.
>
> If you want the output to be written to same file just 'move' this
> temperory file to the input file once you are done.
>
> Note: if there is other stuff in the input file, apart from such
> 'blocks' that you want to preserve, a small modification in step 1
> would take care of it.
>
> hth,
> amit.
>
> --
> ----
> Amit Khemka -- onyomo.com
> Home Page: www.cse.iitd.ernet.in/~csd00377
> Endless the world's turn, endless the sun's Spinning, Endless the quest;
> I turn again, back to my own beginning, And here, find rest.