Linux Rights Management

Source: Internet
Author: User

Three types of permissions for files:
读、写、执行        owner:  属主, u        group:  属组, g        other:  其他, o        all       所有, a

The permissions of a file on whether the user has read and write permissions, first determine whether the identity of the owner, if it is immediately effective, if not, see if the next is in this group, if there is immediately effective, if there is no, look at other identity permissions

chmod 命令 修改文件权限    选项:        -R: 递归修改权限        例子:            chmod -R  755 /data     文件权限:    -rwx            rwx           rwx      421           421           421    文件所有者  文件所属组用户 其它用户

    文件最高权限   666    目录最高权限   777umask的默认权限:    root      0022    普通用户  0002    算文件权限和目录权限:            普通文件 666 - 002                      得到的就是普通文件的权限,有一点普通文件是不能有执行权限的,如果遇到数是奇数再往上加1            目录     777 - 022                目录和文件是有区别的目录直接用777-022得到的结果就是目录的权限文件默认权限   644  -rw-r--r--目录默认权限   755  drwxr-xr-xchown  修改文件的属主和属组    语法:        chown [OPTION]... [OWNER][:[GROUP]] FILE...    常用选项:        -R: 递归    例子:        chown -R web.web /data

Execute permissions work for anyone

For the directory, there is no execute permission to enter this folder, cannot access the folder's metadata, can only look at the file name, cannot access

Default permissions for a folder: Read and execute default

As long as there is a directory of write permissions, you can delete the files or folders inside

X: Add execute permission to directory only, do not add execute permission to files inside folder

An odd number of cases have Execute permissions

Umask value
    umask值 可以用来保留在创建文件权限                新建FILE权限: 666-umask                如果所得结果某位存在执行(奇数)权限,则将其权限+1                新建DIR权限: 777-umask                非特权用户umask是 002                root的umask 是 022                umask: 查看                umask #: 设定                umask 002                umask –S 模式方式显示                umask –p 输出可被调用                全局设置: /etc/bashrc 用户设置:~/.bashrcumask值越大说明新建文件的权限越小,反而创建的文件权限大            root      0022            user     0002  普通文件 666  没有执行权限            666            022   文件夹   777     算文件权限和目录权限:            普通文件 666 - 002                      得到的就是普通文件的权限,有一点普通文件是不能有执行权限的,如果遇到数是奇数再往上加1            目录     777 - 022                目录和文件是有区别的目录直接用777-022得到的结果就是目录的权限文件默认权限   644  -rw-r--r--目录默认权限   755  drwxr-xr-x特殊权限:    三种特殊权限        suid:独立数字法 4 作用:二进制可执行程序            当一个用户运行程序时,它将不是自己身份执行,而变成管理员        sgid   独立数字法 2 作用:二进制可执行程序        sticky  独立数字法 1  粘置位        只能删自己建的文件其它用户建的文件无法删除

Linux Rights Management

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