Split files on Mac OS X with the Text File Splitter
Easily split a single large text file into smaller files on Mac OS X Mavericks while retaining the header row. Select the number of rows to split at, or enter a custom number. Splitting has been tested on files upwards of one million rows. Carriage return and new line terminated records are supported. Select between carriage-return and new-line output record termination.
Great for splitting a single large CSV import file into multiple smaller files.