[GTALUG] Man deletes his entire company

[D. Hugh Redelmeier]

| From: Scott Allen <mlxxxp at gmail.com>

| The script actually contained
| rm -rf {foo}/{bar}
| 
| The error caused foo and bar to be null so the result was
| rm -rf /

I don't know what was processing the commands.  If it was a normal
shell, it ought to have been

	rm -rf ${foo}/${bar}

This is EXACTLY why I start all my shell scripts with
	set -eu
The e means stop on an unexpected non-zero return code.
The u means that referenceing an unset variable is an error.