open(IN, "< $input");
open(OUT, "> $output");

print OUT "--- begin stuff ---\n";
print OUT <IN>;                 # <- this is the cool part
print OUT "---- end stuff ----\n";

close(IN);
close(OUT);

[download]
there would be a few things which would cause this process to go a bit wrong. First, I'd use flock just in case two people decided to copy the file at the same time (chances of this are next to nothing, but why take the chance). Second, i'd binmode because you might be on a OS which distinguishes from binary and text. Finally, instead of printing all at once, i'd print in chunks just to save memory. This is what i'd do: 
my $flock = 1

open (FILE1, "file_to_copy.ext") or die "Can't open for reading: $!";
open (FILE2, ">file_to_create.ext") or die "Can't open for writing: $!
+";
binmode FILE1;
if ($flock == 1) { flock (FILE2, 2); }
binmode FILE2;

while ( read(FILE1,$file_contents,1024) ) { 
  print FILE2 $file_contents; 
}

close (FILE1);
if ($flock == 1) { flock (FILE2, 8); } #this is in fact not needed, th
+anx to crazyinsomniac for pointing out the insignificance ... read "f
+ile locking" for more information
close (FILE2);

[download]

In reply to Re: easy file copy by Parham
in thread easy file copy by tbarron

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