Directory recursive walking

[Paul Backus]

On Thursday, 14 January 2021 at 20:23:37 UTC, dog2002 wrote:
> About 1000 large files.
>
> I want to replace several first bytes in all the files, so I 
> just copy the remaining bytes into a new file. Might this be 
> the reason for high memory consumption? If so, is there a way 
> not to copy the entire file, just delete first bytes and write 
> the replaced bytes into the beginning of the file?
>
> I use Windows x64.

What code are you using to copy the bytes? If you're reading the 
whole file into memory at once, that will consume a lot of memory.