linux. What to do if the permissions are not enough

linux. Insufficient permissions?

linux .Permission means that the permissions of the current directory of linux are insufficient.

Recommended: "Linux Tutorial"

Solution:

sudo -s            #进入root用户模式，仍在原来目录下（不要用su - root,否则进入root目录了）
cd   /var/lib      #进入指定目录
ll                     # 查看该目录下所有文件权限
chmod 777 files-name   #更改指定文件的权限

r means the file can be read (read)

w means the file can be written (write)

x means the file can be executed (if it is a program)

Among them: rwx can also be replaced by numbers

r ————4

w ————–2

x ————1

- ————0

-rw——- (600) Only the owner has read and write permissions

-rw-r–r– (644) Only all Only the owner has read and write permissions, the group and others only have read permissions

-rwx—— (700) Only the owner has read, write, and execute permissions

- rwxr-xr-x (755) Only the owner has read, write, and execute permissions. The group and others only have read and execute permissions

-rwx–x–x (711) Only the owner Only have read, write, and execute permissions. Groups and others only have execution permissions

-rw-rw-rw- (666) Everyone has read and write permissions

- rwxrwxrwx (777) Everyone has read, write and execute permissions

How "755" is formed: "0" means no permission, "1" means executable permission, "2" means write permission, "4" indicates read permission. "7=1 2 4, 5=1 4"

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