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  echo -e "1\n2\n3\n4" | perl -lne 'print if 2..2'

  perl -le 'print 2..2'

  echo -e "1\n2\n3\n4" | perl -lne 'print if 2...2'

  perl -le 'print 2...2'

  $x = $x ....... $y ...... $z ...... $x;
  $y = $x ...... $y ........... $z;
  $z = $x .... $y ........ $z;