chmod
Usage
chmod 600 file.txt
Gives rw- permission to the owner, --- (no permission) to the group, and --- to the others
Permission
Symbolic representation
| Permission | Symbol |
|---|---|
| Read | r |
| Write | w |
| Execute | x |
| No permission | - |
Numeric representation
| Permission Value | Binary Representation (rwx) | Permission Description |
|---|---|---|
| 0 | 000 | No permissions |
| 1 | 001 | Execute permission |
| 2 | 010 | Write permission |
| 3 | 011 | Write and execute permissions |
| 4 | 100 | Read permission |
| 5 | 101 | Read and execute permissions |
| 6 | 110 | Read and write permissions |
| 7 | 111 | Read, write, and execute permissions |
References
https://linovox.com/what-does-chmod-600-mean-and-when-to-use/
https://askubuntu.com/questions/1153204/symbolic-equivalent-of-chmod-600