[jonreem]

On any modern system it's actually "sudo rm -rf / --no-preserve-root" and then entering your password while staring at the command.

"rm -rf ~/blue /" will not come close to deleting / unless you are in the habit of running every command as sudo, even ignoring the presence of --no-preserve-root

[jfb]

Much, much, much the worse is "rm -rf ~ /blue". I don't give a crap about 99% of the stuff outside of $HOME, but of course, the stuff in $HOME is the stuff that's trivial to destroy.

[lloeki]

You're missing the point:

    $ cd dir where there are source files and temp files
    $ rm *.tmp # or so you think
    '.tmp not found'
    # too bad

[daurnimator]

Except when: (these are terrible lessons to learn)

1. You type it into the wrong system (D'oh)

2. You have run `mount --bind / /somewhere/else` then `rm -rf /somewhere` a week later

:(

[colanderman]

It boggles my mind that --one-file-system is not the default :/