$*，“$*”,$@,"$@"的区别

[root@usr001 ~]# set -- "I am" handsome boy #传参数
[root@usr001 ~]# echo $# #打印参数个数
3
[root@usr001 ~]# for i in $;do echo $i;done
I
am
handsome
boy
[root@usr001 ~]# for i in $@;do echo $i;done
I
am
handsome
boy
[root@usr001 ~]# for i in "$@";do echo $i;done
I am
handsome
boy
[root@usr001 ~]# for i in "$";do echo $i;done #把三个参数当作一个参数
I am handsome boy
[root@usr001 ~]# for i;do echo $i;done
I am
handsome
boy
[root@usr001 ~]#