Re: how copy file on linux?

(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.

HTH
--
Lew Pitcher
"In Skills We Trust"