Re: how copy file on linux?

Em 6/26/2024 8:24 PM, Lew Pitcher escreveu:

(Followup set to comp.unix.programmer)
 On Wed, 26 Jun 2024 15:35:00 -0700, Keith Thompson wrote:
 

Thiago Adams <thiago.adams@gmail.com> writes:

How to copy a file on linux keeping the original file information?
timestamp etc?
>
Or in other words the equivalent of CopyFileA from windows.

>
comp.unix.programmer is likely to give you better answers.  I don't
think POSIX defines any functions that copy files.

 No, AFAIK, POSIX doesn't define an "all-in-one" file copy function.
However, Linux (the OS Thiago asks about) defines a number of them.
 

If I uunderstand correctly, you want to do the equivalent of "cp -p",

 Which /can/ be accomplished with POSIX calls
   - the standard I/O functions (fopen()/open(), fread()/read(),
     fwrite()/write(), fclose()/close() ) to copy the file data
   - stat() to obtain the "original file information", and
   - utime() to set the copy timestamps,
   - chmod() to set the copy file permissions
   - chown() to set the file ownership
 But, perhaps Thiago would be satisfied with just a hardlinked file.
 

but from C rather than from a shell.  You might consider using system(),
but that has some drawbacks, and there are probably better ways.

 

I am using this to create a "deploy" folder with all files necessary to run a program. So on windows I am coping dlls and I think it is a good idea to keep the original file attributes . (I am not sure if zip files keep that.. I need to check)
On linux I may need to copy some files and I think is is a good idea to keep the original attributes as well.