split

Split a file into pieces. More information: https://ss64.com/osx/split.html.

• Split a file, each split having 10 lines (except the last split):
  split -l {{10}} {{filename}}
• Split a file by a regular expression. The matching line will be the first line of the next output file:
  split -p {{cat|^[dh]og}} {{filename}}
• Split a file with 512 bytes in each split (except the last split; use 512k for kilobytes and 512m for megabytes):
  split -b {{512}} {{filename}}
• Split a file into 5 files. File is split such that each split has same size (except the last split):
  split -n {{5}} {{filename}}