Thanks! Here's that command line explained bit by bit:
grep grep for
-v lines that DO NOT match
^$ an empty line (begin and end with nothing between)
inputfile in the file "inputfile"
| pipe the results to
split the split program, which divides up a file
-d naming the output files with digits
-l 300000 and putting 300000 lines in each
- getting the input from stdin (the pipe)
outputfile and naming the output files starting with outputfile (fol
+lowed by digits)
Available for small or large Perl jobs; see my home node.