Usage: ./msort [-hrfn] [-t <filed_separators>]  [-k [rfmn]<col>[start-end]{enum1,...},...] [<file>]
Options:
-h  display this document
-l  specify line brokers, you can define more than one characters;  defaultly, they are <newline>
-t  specify field separators, you can define more than one characters; defaultly, they are <space>, <tab>
-r  reverse sort, it will be overwritten if fileds are specified
-f  ignore character`s case, ...
-n  treat fileds as number, ...
-m  treat fileds as number or string, ...
-k  specify fileds to be sorted, eg.
	rn10[2-6]: reverse sort 2-6 (include 6) of column 10, treat it as number
	n11: sort column 11, treat it as number
	f2[6-]: sort 6-end of column 2, treat it as string, ignore case
	rfm3: reverse sort column 3, treat it as string or number, ignore string case
	f3{red green blue}: sort column 3 , treat it as enum, ignore string case
If given file, read text from file, otherwise from STDIN

1.      KmerFreq (a kmer frequency counter),
2.      Corrector (a program which does the correction work), 
3.      merge_pair.pl (extract pairs from two files which contains read1 and read2 separately), 
4.      merge_pair_list.pl (extract pairs from a list of two files).

Options for KmerFreq
-i		[string]        input a file list
-o		[string]        output filename prefix
-q		[int]           quality cutoff [default 5]
-s		[int]           seed length [default 17]
-n		[int]           output kmer index along with frequency ?
                       0: no, 1: yes.[default 0]
-f		[int]           file format: 1: fq, 2: fa.[default 1]
-h/-?                  help

Options for Corrector
-i		[string]        input a read file list
-r		[string]        input kmer frequence file name
-n		[int]           kmer frequency along with index?: 0: no, 1: yes. [default 0]
-k		[int]           start of kmer frequence cutoff [default 5]
-e		[int]           end of kmer frequence cutoff [default 5]
-d		[int]           maximum error bases allowed [default 2]
-s		[int]           seed length [default 17]
-t		[int]           thread number [default 4]
-f		[int]           file format: 1: fq, 2: fa. [default 1]
-h/-?                   help