use Getopt::Long qw(
    :config
    posix_default
    gnu_compat
    bundling
    no_auto_abbrev
    no_ignore_case
);

my $column = 1;

GetOptions(
    'column|c=i' => \$column,
) or die;
...

[download]

I want this program to accept exactly two strings as options, --column and -c, but it also accepts --c. I want the prefix for short options to be - and only -, similar to how -- is treated for long options when bundling is enabled

posix_default sets POSIXLY_CORRECT and then from Configuring Getopt::Long ...
prefix_pattern
A Perl pattern that identifies the strings that introduce options. Default is --|-|\+ unless environment variable POSIXLY_CORRECT has been set, in which case it is --|-.

In reply to Re: Enforce single hyphen for single character options in Getopt::Long by parv
in thread Enforce single hyphen for single character options in Getopt::Long by mrnoname1000

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