


Linux cannot open directory, prompts insufficient permissions
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
Additional knowledge points:
r means the file can be read (read)
w means that the file can be written (write)
x means that the file can be executed (if it is a program)
where: rwx can also be replaced by a number
r ————4
w ————–2
x ————1
- ————0
-rw— —- (600) Only the owner has read and write permissions
-rw-r–r– (644) Only the owner has read and write permissions, the group and others only have read permissions 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 has read, write, and execute permissions, the group and others only have execute permissions 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, and "4" means read permission. "7=1 2 4, 5=1 4"
Recommended tutorial:linux tutorial
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