Graham Lyons bb9f8584c3 Use the rm command with -P as a shred fallback (#179) ...

* Use the `rm` command with `-P` as a shred fallback

The newer versions of OSX (Sierra) have neither `shred` nor `srm`.
They do have `rm` with the `-P` option, so we can fall back to that
before resorting to plain old `rm`.

* Add double-quotes and braces to the shell variable.

We should treat the variable as a string, and we should also be safe
when interpolating it.

2018-04-13 13:31:52 -04:00

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