Set the correct chmod permissions for each scenario
Linux permissions use 3 digits: Owner Group Other
4 = read (r)2 = write (w)1 = execute (x)Add them up: 7 = rwx, 6 = rw-, 5 = r-x, 4 = r--
Example: 755 = rwxr-xr-x (owner=rwx, group=r-x, other=r-x)
setuid (4) - Run as the file's owner, not the user (e.g., 4755)setgid (2) - Run as file's group; on directories, new files inherit group (e.g., 2775)sticky bit (1) - On directories: users can only delete their own files (e.g., 1777 for /tmp)