linux 特殊环境变量

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$ 相关的变量

root@iZbp152coo41my4pjzp4smZ:~# set -- "I am" handsome oldboy.
root@iZbp152coo41my4pjzp4smZ:~# echo $#
3
root@iZbp152coo41my4pjzp4smZ:~# for i in $*; do echo $i; done

root@iZbp152coo41my4pjzp4smZ:~# for i in $@; do echo $i; done
I
am
handsome
oldboy.

root@iZbp152coo41my4pjzp4smZ:~# for i in "$*"; do echo $i; done
I am handsome oldboy.
root@iZbp152coo41my4pjzp4smZ:~# for i in "$@"; do echo $i;done
I am
handsome
oldboy.