Hi,
update:checking File::Find, I now think that find(\%options, @directories); is more what you should try to do...

you need to pass it as a parameter to the wanted() call like:

#!/usr/bin/perl
use strict;
use warnings;
use File::Find;

use vars qw/*name *dir *prune/ ;
*name   = *File::Find::name ;
*dir    = *File::Find::dir ;
*prune  = *File::Find::prune ;

my $size_input;
my $fs_input = '/tmp';
    $size_input = ( int 25 * ( 1024**2 ) ) ;
    $size_input =~ tr /\000//d ;
    sub wanted ;
    File::Find::find({wanted => \&wanted($size_input)}, $fs_input ) ;

sub wanted {
    my ($size_input ) = @_ ;
    print "FSINPT:\t",$fs_input,"\n";
    print "SizeINPT:\t",$size_input,"\n";
    return;
}    ###-- End sub --###
[download]

at least returns the following:

FSINPT: /tmp
SizeINPT:       26214400
Odd number of elements in anonymous hash at 686513.pl line 17.
Use of uninitialized value in subroutine entry at /usr/share/perl/5.8/
+File/Find.pm line 822.
Can't use string ("") as a subroutine ref while "strict refs" in use a
+t /usr/share/perl/5.8/File/Find.pm line 822.
[download]

so the size parameter has been "accepted" by wanted.