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        Groups => { 1 => 'System', 2 => 'Other' },
        Notes => q{
            extracted only if specifically requested or the API L<SystemTags|../ExifTool.html#SystemTags> or L<RequestAll|../ExifTool.html#RequestAll>
            option is set.  Returns user ID number with the -n option, or name
            otherwise.  May be written with either user name or number
        },
        Writable => 1,
        WritePseudo => 1,
        DelCheck => q{"Can't delete"},
        Protected => 1, # all writable pseudo-tags must be protected!
        PrintConv => 'eval { getpwuid($val) } || $val',
        PrintConvInv => 'eval { getpwnam($val) } || ($val=~/[^0-9]/ ? undef : $val)',
    },
    FileGroupID => {
        Groups => { 1 => 'System', 2 => 'Other' },
        Notes => q{
            extracted only if specifically requested or the API L<SystemTags|../ExifTool.html#SystemTags> or L<RequestAll|../ExifTool.html#RequestAll>
            option is set.  Returns group ID number with the -n option, or name
            otherwise.  May be written with either group name or number
        },
        Writable => 1,