split-print $NR_PARTITIONS /path/to/big/file

  split-print is conceptually similar to the traditional
  split(1) utility, except it does not write out files.  It will
  instead output byte ranges for other applications (like
  cat-range-exec) to pick up.

  The file ranges outputted by split-print will
  end at a newline boundary (assuming the file has
  any newlines in it at all).

    $ split-print 4 foo.log
    0-54196096
    54196097-108392108
    108392109-162588180
    162588181-216783853

  It will always output the byte range for at least one
  partition, but may output less than the specified number of
  partitions if the buffer size is too small.

  Lines along partition points may not be longer than 64K (lines
  this long are very rare in practice).