Do you need read permissions to execute?
You don’t need read permission in order to execute a file. In fact, if you have read permission, but not execute permission, you can’t execute the file. The execute permission allows you to ask the system to execute the script file.
Does read and execute allow copying?
If one has read permission, they can just read the contents, copy them in a new file, add execute permission to that new file, and execute the new file. If one has execute permission, then the file instructions have to be read, and hence read permission is implied.
What does read and execute mean in permissions?
Read & execute: Allows users to view and run executable files, including scripts. List folder contents: Permits viewing and listing of files and subfolders as well as executing of files; inherited by folders only. Read: Allows users to view the folder and subfolder contents.
What does 3 Permission bit octets represent?
The three rightmost digits define permissions for the file user, the group, and others. Each digit of the three rightmost digits represents a binary value, which controls the “read”, “write” and “execute” permissions respectively.
What is the difference between execute and read write permissions?
Execute: Execute permission for a file means you can run/execute a file. This permission makes sense only to files which can be executed, for example, shell scripts, C language object files (file that you get after compiling a C program) etc. Watch the video below to see a demonstration for the same Understanding Permissions for Directory
What does read permission for a directory mean?
Read: Read permission for the directory means you can view the contents of the directory i.e., files and sub-directories. For example, the figure below shows that when the read permission is denied the user is not able to view the contents of the directory anymore.
Do you still get permission denied when executing as another user?
I still get permission denied when executing as another user. You need both read and execute permissions on a script to be able to execute it. If you can’t read the contents of the script, you aren’t able to execute it either. There’s a half truth to the previous statements.
Can a root user set permissions for a file?
Both the root user and the file’s owner can set file permissions. chmod has two modes, symbolic and numeric. First, you decide if you set permissions for the user (u), the group (g), others (o), or all of the three (a).