linux 775和777权限有什么区别 谁举个例子
回复讨论(解决方案)
读取权限 r = 4
写入权限 w = 2
执行权限 x = 1
775 这三个数字代表拥有者,组用户,其他用户的权限。
例如:
7 拥有者有 读取,写入,执行权限
7 组用户有 读取,写入,执行权限
5 其他用户有 读取,执行权限(4+1 = 5)
777 与 775的区别是
其他用户有写入权限,而775的没有。
举个例子:
文件A,权限是775
root是拥有者
www-data是组用户
ooo 是其他用户
那么
root,www-data,ooo都能对文件A读取和执行。
root,www-data 能对文件A写入。
ooo不能对文件A写入。
如果是777
则三个用户都能读取,写入,执行文件A
你可以在linux终端先输入ls -al,可以看到如:
-rwx-r--r-- (一共10个参数)
第一个跟参数跟chmod无关
2-4参数:属于user
5-7参数:属于group
8-10参数:属于others
接下来就简单了:r==>可读 w==>可写 x==>可执行
r=4 w=2 x=1
所以755代表 rwxrwxr-x
777代表 rwxrwxrwx
你可以上???下,使用chmod命令修改?限,和chown命令?修改?有者,?用?
读取权限 r = 4
写入权限 w = 2
执行权限 x = 1
775 这三个数字代表拥有者,组用户,其他用户的权限。
例如:
7 拥有者有 读取,写入,执行权限
7 组用户有 读取,写入,执行权限
5 其他用户有 读取,执行权限(4+1 = 5)
777 与 775的区别是
其他用户有写入权限,而775的没有。
举个例子:
文件A,权限是775
root是拥有者
www-data是组用户
ooo 是其他用户
那么
root,www-data,ooo都能对文件A读取和执行。
root,www-data 能对文件A写入。
ooo不能对文件A写入。
如果是777
则三个用户都能读取,写入,执行文件A
其实我的问题是
7 拥有者有 读取,写入,执行权限
7 组用户有 读取,写入,执行权限
5 其他用户有 读取,执行权限(4+1 = 5)
怎么知道他是拥有着 或者是组用户 或者其他用户 。。。。。。。。。。。比方说FTP算组用户还是其他用户?
ls -lt filename
头两个就是拥有者与组用户了
ls -lt filename
头两个就是拥有者与组用户了
[root@iZ23340us9qZ home]# ls -lt wwwroot/
总用量 4
drwxrwxrwx 4 www www 4096 9月 26 20:39 default
[root@iZ23340us9qZ home]#
我不会怎么区分组用户还是其他用户 。。。。。
drwxrwxrwx 4 www www 4096 9月 26 20:39 default
红色是拥有者,蓝色是组用户,不在这两个内的是其他用户。

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