Re: find -newer problem

[Allan WIlkins <devnull4spam at yahoo dot co dot uk>]

Iv done a bit more investigating. as I thought It might be something to 
do with the seconds (ls -l not displaying the seconds). The program t.c 
containing:

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

main(int argc,char *argv[])
{
   struct stat finfo;

   stat(argv[1],&finfo);
   printf("Access      : %s\n",ctime(&finfo.st_atime));
   printf("Modification: %s\n",ctime(&finfo.st_mtime));
   printf("Change      : %s\n",ctime(&finfo.st_ctime));
}

produces:

$ ./t XXX
Access      : Tue Jun 28 00:00:00 2005

Modification: Mon Jun 27 12:21:30 2005

Change      : Mon Jun 27 12:21:30 2005

$ ./t YYY
Access      : Tue Jun 28 00:00:00 2005

Modification: Mon Jun 27 12:21:30 2005

Change      : Mon Jun 27 12:21:30 2005

Exactly the same times so I wrote :

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

main(int argc,char *argv[])
{
   struct stat finfo1, finfo2;

   stat(argv[1],&finfo1);
   stat(argv[2],&finfo2);

   printf("%s: %s",argv[1],ctime(&finfo1.st_mtime));
   printf("%s: %s",argv[2],ctime(&finfo2.st_mtime));

   if (finfo1.st_mtime > finfo2.st_mtime){
       printf("File 1 newer than file 2\n",ctime(&finfo2.st_mtime));
   }
}

that produces:

$ ./fcmp XXX YYY
XXX: Mon Jun 27 12:21:30 2005
YYY: Mon Jun 27 12:21:30 2005
$ >a
$ >b
$ ./fcmp b a
b: Tue Jun 28 10:19:44 2005
a: Tue Jun 28 10:19:42 2005
File 1 newer than file 2

So I've now written newer.c to solve my problem

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

main(int argc,char *argv[])
{
   struct stat finfo1, finfo2;

   stat(argv[1],&finfo1);
   stat(argv[2],&finfo2);

   if (finfo1.st_mtime > finfo2.st_mtime){
       printf("%s\n",argv[1]);
   }
}

But I still don't really understand what find is doing.

Sorry about the cygcheck -s -v -r  :-(

Al


Igor Pechtchanski wrote:

> On Mon, 27 Jun 2005, Allan WIlkins wrote:
>
>  
>
> > I must apologise if this is an already known problem but I have been
> > unable to locate any reference to it in the mail archives.
> >
> > Executing a find using the -newer parameter returns files that appear to
> > be of the same age. e.g.
> >
> > $ find XXX -newer YYY
> > XXX
> > $ ls -l XXX YYY
> > -r--r--r--  1 allanw Domain Users 10291 Jun 27 10:38 XXX
> > -r--r--r--  1 allanw Domain Users  5865 Jun 27 10:38 YYY
> > $ ls -lu XXX YYY
> > -r--r--r--  1 allanw Domain Users 10291 Jun 27 00:00 XXX
> > -r--r--r--  1 allanw Domain Users  5865 Jun 27 00:00 YYY
> > $ ls -lc XXX YYY
> > -r--r--r--  1 allanw Domain Users 10291 Jun 27 12:21 XXX
> > -r--r--r--  1 allanw Domain Users  5865 Jun 27 12:21 YYY
> >
> > However:
> > $ touch AAA BBB
> > $ find AAA -newer BBB
> > $ ls -l AAA BBB
> > -rw-r--r--  1 allanw Domain Users 0 Jun 27 12:11 AAA
> > -rw-r--r--  1 allanw Domain Users 0 Jun 27 12:11 BBB
> > $ ls -lc AAA BBB
> > -rw-r--r--  1 allanw Domain Users 0 Jun 27 12:11 AAA
> > -rw-r--r--  1 allanw Domain Users 0 Jun 27 12:11 BBB
> > $ ls -lu AAA BBB
> > -rw-r--r--  1 allanw Domain Users 0 Jun 27 00:00 AAA
> > -rw-r--r--  1 allanw Domain Users 0 Jun 27 00:00 BBB
> > So if the files are created using touch the find does not return anything.
> >
> > I understand that ls -l displays the last modification time. Is the find
> > using the same date?
> >    
>
> find *is* using the same date, but you may be running into filesystem
> granularity issues.  FAT, for example, stores dates with the granularity
> of 2 seconds.  You may also want to try "test AAA -nt BBB" and "test BBB
> -nt AAA", to see whether you get results that are consistent with "find".
>
>  
>
> > Thanks in advance
> > Al
> >
> > The output of a cygcheck -s -v -r > cygcheck.out follows
> > ====================================================
> > [snip cygcheck output]
> > [snip *another* cygcheck output]
> >    
>
> In the future, please *attach* the output of "cygcheck -svr" instead of
> including it in-line.  It cuts down on false positive matches in archive
> searches.
>
> HTH,
> 	Igor
>  

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