How to split one text file into multiple *.txt files?

Question

I got a text file file.txt(12 MBs) containing:

something1
something2
something3
something4
(...)

Is there any way to split

Answer 1

$ split -l 100 input_file output_file

where -l is the number of lines in each files. This will create:

• output_fileaa
• output_fileab
• output_fileac
• output_filead
• ....