I'm replacing @ARGV arguments with command-line switches in an existing program.   When the script contains this chunk, it works fine called as script.pl 
my %file = (
    in   => 'switches.txt',
    );
@ARGV = $file{in};
chomp (@ARGV = <>);
foreach my $nonsane (@ARGV) {
    chomp $nonsane;
    unless ($nonsane =~ (/^(\w|-|\.)+$/)) {
        print "  Ack - $nonsane is an improperly formatted device name
+.\n";
        print "  Only alphanumeric, underscore, dash and dot allowed.\
+n";
        exit;
        }
    }
print ("  Specified target names all valid.\n");

[download]

But when this chunk is in place, it doesn't seem to properly read $file{in} into @targets, when called as script.pl --infile switches.txt. 

use Getopt::Long;
GetOptions( 'infile|i=s'  => \$opt_infile, );
if (defined $opt_infile) {
    $file{in} = $opt_infile;
    (@targets = $file{in});
    }
foreach my $nonsane(@targets) {
    chomp $nonsane;
    unless ($nonsane =~ (/^(\w|-|\.)+$/)) {
        print "  Ack - $nonsane is an improperly formatted device name
+.\n";
        print "  Only alphanumeric, underscore, dash and dot allowed.\
+n";
        exit;
        }
    }
print ("  Specified target names all valid.\n");

[download]

The latter fails, and gives the *filename* as $nonsane in the 'Ack' error.   They're both reading the same input file, which looks somewhat like this:   (plain-text file, one entry per line, IP address, hostname, or FQDN)
172.31.1.1
192.168.1.1
switchname
router.domain

I tried chomp'ing a few different ways, with no success.   Fellow monks, what might I be overlooking, misunderstanding, or misapplying?

Perl 5.00503 on Debian Linux
#!/usr/bin/perl -w
use strict;


    cheers,
    Don
    striving toward Perl Adept
    (it's pronounced "why-bick")

In reply to replace @ARGV args with Getopt::Long switches by ybiC

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