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      go真是太贴心了， 来看看用go的flag包来解析命令行参数：

package mainimport(	"flag"	"fmt"	)func main() {	var l = flag.Int("l", 0, "para l is for len")	var c = flag.String("c", "nothing", "para c is for content")	flag.Parse()	fmt.Println(*l)	fmt.Println(*c)	flag.Usage()}

      看下结果：

ubuntu@VM-0-15-ubuntu:~/taoge/go$ go build test.go ubuntu@VM-0-15-ubuntu:~/taoge/go$ ./test 0nothingUsage of ./test:  -c string     para c is for content (default "nothing")  -l int     para l is for lenubuntu@VM-0-15-ubuntu:~/taoge/go$ ubuntu@VM-0-15-ubuntu:~/taoge/go$ ubuntu@VM-0-15-ubuntu:~/taoge/go$ ubuntu@VM-0-15-ubuntu:~/taoge/go$ ./test -l1 -caflag provided but not defined: -l1Usage of ./test:  -c string     para c is for content (default "nothing")  -l int     para l is for lenubuntu@VM-0-15-ubuntu:~/taoge/go$ ubuntu@VM-0-15-ubuntu:~/taoge/go$ ubuntu@VM-0-15-ubuntu:~/taoge/go$ ubuntu@VM-0-15-ubuntu:~/taoge/go$ ./test -l=1 -c=a1aUsage of ./test:  -c string     para c is for content (default "nothing")  -l int     para l is for lenubuntu@VM-0-15-ubuntu:~/taoge/go$ ubuntu@VM-0-15-ubuntu:~/taoge/go$ ubuntu@VM-0-15-ubuntu:~/taoge/go$ ubuntu@VM-0-15-ubuntu:~/taoge/go$ ./test -l 1 -c a1aUsage of ./test:  -c string     para c is for content (default "nothing")  -l int     para l is for lenubuntu@VM-0-15-ubuntu:~/taoge/go$ ubuntu@VM-0-15-ubuntu:~/taoge/go$ ubuntu@VM-0-15-ubuntu:~/taoge/go$ ubuntu@VM-0-15-ubuntu:~/taoge/go$ ./test  -c ab  -l 22abUsage of ./test:  -c string     para c is for content (default "nothing")  -l int     para l is for lenubuntu@VM-0-15-ubuntu:~/taoge/go$ ubuntu@VM-0-15-ubuntu:~/taoge/go$ ubuntu@VM-0-15-ubuntu:~/taoge/go$ ubuntu@VM-0-15-ubuntu:~/taoge/go$ ./test  -l 234234nothingUsage of ./test:  -c string     para c is for content (default "nothing")  -l int     para l is for lenubuntu@VM-0-15-ubuntu:~/taoge/go$ ubuntu@VM-0-15-ubuntu:~/taoge/go$ ubuntu@VM-0-15-ubuntu:~/taoge/go$ ubuntu@VM-0-15-ubuntu:~/taoge/go$ ./test  -l 234  -s abcflag provided but not defined: -sUsage of ./test:  -c string     para c is for content (default "nothing")  -l int     para l is for lenubuntu@VM-0-15-ubuntu:~/taoge/go$

         练练手， 不多说。

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