Позивтив, грубо говоря, не нужен. Это убунтовское. -- at@ in devel@ ...
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ID Status Resolution Sev Product Comp Assignee Reporter Summary
17720 NEW --- enh Sisyphus shadow-u sem imz if the user already exists, useradd could check for compatibility with the request

File a new bug in the "shadow-utils" component of the "Sisyphus" product