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How to delete the last two lines of a Text file, keeping all empty lines in the body of the file?

carcase
carcase asked
on
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Last Modified: 2008-02-01
***I'm very new to PERL.

How does one delete the last two lines of a file while keeping all other lines (even when it contains only escape sequences \r\n )?

My original file contains several groupings, each delimited by \r\n\r\n.  Within each grouping are subsections, each delimited by \r\n.

example:  
___
group 1 line 1
group 1 line2

group 2 line 1
group 2 line 2
___

When I have attempted to remove the last two lines by reading the original file into an array, then writing out to a new file, the \r\n\r\n  sequences  are replaced with a single \r\n.  This merges all my groupings into one

example:
___
group 1 line 1
group 1 line 2
group 2 line 1
group 2 line 2
___
My code is attached.
#!/usr/bin/perl
open (FIL, "BillTestFile.txt");
 
@array=<FIL>; #read the file into an array
$end=@array; #total in array
close (FIL);
$end=$end-2; #total in array minus two
 
#reopen file for writing
open (FIL, ">OUTPUT.txt") or die "Can't open file: $!\n"; 
 
for($i = 0; $i < $end; $i++){
     print FIL "$array[$i]"; #write array at line "i"
     $i++; #go to next line
} #End for loop
 
close (FIL);

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