split \*- split a file into pieces
it in 1000-line pieces, as many as are necessary, onto
a set of output files. The name of the first output
file is file2 with an `a' appended, and so on
through the alphabet and beyond. If no output name is given,
If no input file is given, or the first argument is `\*-',
then the standard input file is used.
Watch out for 14-character file names.
The number of lines per file should be