split

type SplitOptions struct {
	Lines       int    // -l: put NUMBER lines per output file
	Bytes       string // -b: put SIZE bytes per output file
	Number      int    // -n: generate N output files
	Suffix      int    // -a: generate suffixes of length N (default 2)
	NumericSufx bool   // -d: use numeric suffixes
	Verbose     bool   // --verbose: print diagnostic
}