File permission settings

1. Create file a.txt set to rwx r_x

Chmod A.txt

method 2 chmod g+x a.txt

2, Modify /root/a.txt owner for qiming belongs to group Xuegod

Chown qingming:xuegod a.txt

3 ', if umask value is 044 log in as root create file b.txt default permissions Why?

RWX WX WX | 733 All users can write executable trojan ??

3, all permissions for The 777 directory /bin

4 . Create a file that no one can delete

Vi C.txt

Chattr +i +a c.txt Delete permission chattr-i–a view lsattr c.txt

File permission settings