Add: command for continue list disk space status

	add command for continue list disk space status via watch
	command, but no remove old while command area to avoid some
	environment do not have watch in system-wide utils.
Fix: remove tail space and space line, adjust comment of command

	fix command comment
	separate two command from one line into two line
	rename small_file_ into file_prefix for more accurate condiction
	remove tail space line and tail space
Merge pull request #1 from guesslin/master

Add new command for condition 20 and remove tail space line