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  1. or download this
    $ perl -wE 'say POSIX::cuserid'
Name "POSIX::cuserid" used only once: possible typo at -e line 1.
say() on unopened filehandle cuserid at -e line 1.
  2. or download this
    $ perl -MPOSIX -wE 'say POSIX::cuserid'
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