Note that this is a non-standard way of doing command line options. That's why Getopt::Long is having trouble recognizing what you want to do. You may have better luck changing the syntax of your script so that it supports something like this: 
$ script --id="1.0.0.1 1.0.0.2 1.0.0.3"
  # split the resulting variable on spaces

$ cat >id.dat
1.0.0.1
1.0.0.2
1.0.0.3
$ script --id=@id.dat

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In addition, if your script takes no "filename"-like arguments (arguments not preceeded by an option), consider making IP addresses an optional argument in this respect: 
Usage: script.pl [-abcde] [ip_address [ip_address ...]]

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Or, if your script does depend on, say, one additional argument, consider putting that in a flag, either making that option mandatory or using a suitable default (like stdin for a file), or just add it to the list of non-option arguments: 
Usage: script.pl [-abcde] -f filename [ip_address [ip_address ...]]
Usage: script.pl [-abcde] filename [ip_address [ip_address ...]]

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Multiple arguments after a single option tag is kind of strange for people used to "standard" command line options for scripts and utilities. I would think about re-working the interface instead of trying to force Getopt to play by these other rules.

In reply to Re: Getopt Behavior by Fastolfe
in thread Getopt Behavior by gaspodethewonderdog

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