How do I blacklist a command in Linux?

Question

I would like to blacklist a command in Linux or add it to sudo to avoid typing it by accident.

I was trying to fix my RVM and for some reason typed:

rvm reset

And lost all my gemsets.

I would like to change this behavior to sudo rvm reset and perhaps add a comment that says what this command will do.

Answer 1

I would wrap a shell function around rvm:

rvm () {
    case $1 in
        reset)
            echo "danger Will Robinson" >&2
            echo "run 'command rvm reset' if you really want it" >&2
            ;;
        *) command rvm "$@" ;;
    esac
}

Answer 2

chown root `which rvm` 
chmod 0700 `which rvm`

to restrict gemset delete command use something like this:

chown -R root `rvm gemdir`
sudo chmod -R 0755 `rvm gemdir`

even chmod maybe unnecessary. But you'll need sudo for new gemset installations.