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gsplit

brew install coreutils
gsplit -l 5000 -d --additional-suffix=.log $FileName file-
  • -l 5000: split file into files of 5,000 lines each
  • -d: numerical suffix. This will make the suffix go from 00 to 99 by default instead of aa to zz.
  • --additional-suffix: lets you specify the suffix, here the extension $FileName: name of the file to be split.
  • file: prefix to add to the resulting files.