shadow 文件权限 $ll shadow ---------- 1 root root 1131 Aug 6 12:04 shadow 可以看出只有root可以操作它，普通用户执行passwd，内部也是先隐式切到root，改完再回到普通用户 shadow文件内容 # head -3 /etc/...
文件内容 ## # User Database # # Note that this file is consulted directly only when the system is running # in single-user mode. At other times this information is provided by # Open Directory. # ...
