C:\chas_sandbox\pwgen>
copy con randfromtwo.pl
my @array1=('1', '2', '3');
my @array2=('a', 'b', 'c');
print $array1[rand(@array1)];
print $array2[rand(@array2)];
print $oneElementOfTheseTwoArrays = (@array1, @array2)[int(rand($#array1+$#array
2))];
^Z
        1 file(s) copied.

C:\chas_sandbox\pwgen>
randfromtwo.pl
2ba
C:\chas_sandbox\pwgen>
randfromtwo.pl
1ba
C:\chas_sandbox\pwgen>
randfromtwo.pl
1c3
C:\chas_sandbox\pwgen>
randfromtwo.pl
3b1
C:\chas_sandbox\pwgen>
randfromtwo.pl
3c2
C:\chas_sandbox\pwgen>

##</code><code>##

C:\chas_sandbox>
perl -Mdiagnostics -le "sub doit{$ref=$_;${$ref} = 'nope'};$str='cwh';print $str
;doit(\$str);print$str"
cwh
cwh

C:\chas_sandbox>
perl -Mdiagnostics -le "sub doit{$ref=$_;${$ref} = 'nope'};$str='cwh';print $str
;doit(\\$str);print$str"
cwh
cwh

C:\chas_sandbox>
perl -Mdiagnostics -le "sub doit{$ref=$_;$$ref = 'nope'};$str='cwh';print $str;d
oit(\\$str);print$str"
cwh
cwh

C:\chas_sandbox>
perl -Mdiagnostics -le "sub doit{$ref=$_;$$ref = 'nope'};$str='cwh';print $str;d
oit(\$str);print$str"
cwh
cwh

C:\chas_sandbox>

##</code><code>##

C:\chas_sandbox>
perl -Mdiagnostics -le "sub doit{$ref=$_;\\$ref = 'nope'};$str='cwh';print $str;doit($str);print$str"
Can't modify single ref constructor in scalar assignment at -e line 1, near "'nope'}"
Execution of -e aborted due to compilation errors (#1)
    (F) You aren't allowed to assign to the item indicated, or otherwise try to change it, such as with an auto-increment.

Uncaught exception from user code:
        Can't modify single ref constructor in scalar assignment at -e line 1, near "'nope'}"
Execution of -e aborted due to compilation errors.
 at -e line 1

C:\chas_sandbox>

##</code><code>##

#/usr/bin/perl -Wl

use strict;
use warnings;
use Parse::RecDescent;
use Data::Dumper;
use Data::Serializer;

my $grammar;
my $grammarfile = $ARGV[0];
open my $gf,'<',$grammarfile or die 'bad grammarfile';

while (<$gf>) {
    $grammar.=$_;
}

close $gf;

print '$grammar is ',"\n",$grammar;

$::RD_HINT++;
#$::RD_TRACE++;

my $parser = new Parse::RecDescent ($grammar) or die 'bad grammar';

my $stringtoparsefile = $ARGV[1];

open my $sf,'<',$stringtoparsefile or die 'bad stringstoparse file';

my $result;
my $reresult;
my $serializer = Data::Serializer->new(portable   => '0',serializer => 'Data::Dumper');
my $outfilebasename = 'data';
my $outfileext = 'out';
my $outfileindex = 10;
while (<$sf>) {
    print 'parsing $_: ',$_;
    if (defined $parser->startrule($_)){
        $result = $parser->startrule($_);
        print Dumper($result);
        $serializer->store(
            $result,
            $outfilebasename.$outfileindex.'.'.$outfileext,
            '>>'
        );
        $reresult = $serializer->retrieve(
            $outfilebasename.$outfileindex++.'.'.$outfileext,
        );
        print Dumper($reresult);
    }else{ print "  badstring\n"}
}

##</code><code>##

startrule: commandline{$item{commandline}}
commandline: command options {[$item {command},$item{options}]}
command: packagecommand {$item{packagecommand}}
packagecommand: /(hap)/ | /(hccmrg)/ | /(hup)/ | /(hspp)/ | /(hpp)/ | /(hpg)/ | /(hdp)/ | /(hdlp)/ | /(hcp)/
options: option(s?) 
option: optionflag optionvalue { [$item{optionflag}, $item{optionvalue}?$item{optionvalue}:1] }
optionflag: /(-\w+)/ { $1 }
optionvalue: /(\w*)/ { $1 }

##</code><code>##

hap -b
hap -b sknxharvest01
hap -b sknxharvest01 -enc testfile.dfo
hap -b sknxharvest01 -usr cgowing -pass chaspass
hap -badflag
hap -prompt
hap -b sknxharvest01 -prompt
hap -prompt -b sknxharvest01