Im going to be making and removing lots of directories using ruby and Im
feeling a bit uneasy about it. One of my fears is that a potential typo
after refactoring, cutting and pasting etc could cause my program to
delete innocent and system vital directories.

This creation and deletion code will be spread around my project and not
just one place which makes it more prone to errors. For instance my
tests will have to constantly remove any directories created during
testing.

Am i just being paranoid or do you black belt ruby developers have a few
tricks to guard yourself from this hazzard?
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