the_train_man wrote: > On Oct 22, 10:32 am, [EMAIL PROTECTED] (Dr.Ruud) wrote: > >> [EMAIL PROTECTED] schreef: >> >> >>> I would like to replace a part of a really big (4GB) text file. And >>> the contents that I want to change is really a small but continuous >>> portion. Could some one please help me with the best way I can do this >>> in perl? >>> >> Is the replacement guaranteed to be the same size as the original? >> >> -- >> Affijn, Ruud >> >> "Gewoon is een tijger." >> > > Thanks for your suggestion. > > No, the resulting file may be different in file length. > > To be more specific, > > Consider the file contents as: > > A > B > C > D > E > F > G > H > > and I want to replace the lines 2-4 which may result in a file being > > A > X > Y > Z > D > E > F > G > H > > the problem that I am facing is the time it takes to write out the > line 5 to end of file in cases where the file size run into GBs. > > Is there a way I can cat the contents from D to H to the modified top > portion? > > Thanks, > > > If you're on a *NIX then initially use "split". Modify the relevant file, and then you can just use cat old_end >> new_start. Otherwise there are similar utilities for other platforms (I think hjsplit should work for windows).
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