Are you passing multiple values to the --foo argument or one string value with spaces? If the former, you can use something like this: 
myhack.pl --foo bar1 --foo bar2 --foo bar3

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Be sure to change GetOptions ("foo=s" => \$foo); to GetOptions ("foo=s" => \@foo);

see: Options with multiple values

In reply to Re: Space in getopt option value by frozenwithjoy
in thread Space in getopt option value by Anonymous Monk

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