split - split a large file into several smaller files
split [-n] [file [prefix]]
-n Number of lines per piece (default: 1000)
split -200 file # Split file into pieces of 200 lines each
split file z # Split file into zaa, zab, etc.
Split reads file and writes it out in n-line pieces. By default, the
pieces are called xaa, xab, etc. The optional second argument can be
used to provide an alternative prefix for the output file names.