How about this?

use strict;
use warnings;
use feature 'say';

@ARGV or die 'No range specified';
# Check if the range was specified correctly.
# This will filter out negative numbers as well.
$ARGV[0] =~ /\A(?:\d+)?-(?:\d+)?\Z/ or die 'Invalid range';

my @commands = qw(zero one two three four);

# In case one of the values was not specified it will become an empty 
+string
my ($start, $end) = split '-', $ARGV[0];
# Since an empty string evaluates to false we can assign default value
+s like this
$start = 0 unless $start;
$end = $#commands unless $end;
# Negative indices are filtered out by the first regex so we only need
+ to check if the index is not too big.
die "$start is out of range" unless $start < @commands;
die "$end is out of range" unless $end < @commands;

# The range is sure to be valid now so we can simply use .. to generat
+e a list
foreach my $index ($start .. $end) {
    say $commands[$index];
}

[download]

In reply to Re: Specifying a range of indices via the command line by kroach
in thread Specifying a range of indices via the command line by eyepopslikeamosquito

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