I have an ext4 formatted usb hard disk, I want to use to move between different computers with different users. How should I set its directories' permissions it, so that every user can r/w? What should file permissions look like (its mainly movies and mp3s).
If you really don't care who writes what where, and assuming the disk is mounted at
The first command will set read and write permissions for everyone, on every file on the disk; the second will set read, write, and execute permissions, on every directory. (On directories, execute permission enables traversal, i.e., descent past that directory into others contained within it.)
For more details, try