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etcd_read

shell

$*和$@都表示传递给函数或脚本的所有参数,不被双引号("")包含时,都以"$1 $2... $n"的形式输出所有参数
当它们被双引号("")包含时,"$*"会将所有的参数作为一个整体,以"$1 $2...$n"的形式输出所有参数,"$@"会将各个参数分开,以"$1" "$2"... "$n"的形式输出所有参数

shift命令每执行一次 变量的个数($#)剪一 (之前的$1变量被销毁,之后的$2就变成了$1),而变量值提前一位。
同理,shift n后,前n位参数都会被销毁

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