$*，「$*」,$@,"$@"的區別

[root@usr001 ~]# set -- "I am" handsome boy #傳參數
[root@usr001 ~]# echo $# #打印參數個數
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 #把三個參數當作一個參數
I am handsome boy
[root@usr001 ~]# for i;do echo $i;done
I am
handsome
boy
[root@usr001 ~]#