#!/usr/bin/perl
use strict;                             # parameter Definition before use them
use warnings;

# Version 0.3

my $BString = "Start";
my $EString = 'End';

sub ask_user {
    my $question = shift;

    print $question, ": ";
    chomp( my $answer = <STDIN> );

    return $answer;
}



#> main
#> -------------------------------------------------------------------------

system("clear");
my $infile  = ask_user( "Please name the input file" );
my $outfile = ask_user( "Please name the output file" );
my $number  = ask_user( "Please enter the call number" );

open my $in,  '<', $infile      or die "open($infile, ro) failed: $!\n";
open my $out, '>', $outfile     or die "open($outfile, w) failed: $!\n";

my @alldata;
my @data;
my $flag = 0;
while ( my $line = <$in> ) {
    if ( $line =~ m/$BString/ .. $line =~ m{$EString} ) {

        # speichere Zeilen von $Bstring bis $EString
        push @data, $line;

        $flag = 1       if $line =~ m{Number=$number};

        if ( $line =~ m{$EString} ) {
            push @alldata, @data;

            if ( $flag == 1 ) {
                print $out @data;
                $flag = 0;
            }

            @data = ();
        }
    }
}

close $out;
close $in;