Never 'rm -rf' unless you really, REALLY mean it. https://twitter.com/mattbd/status/720658734142369792

Eric Woodward

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@itsericwoodward Anytime I run a sudo command, I first run “echo sudo […]”, review the output, then run again without echo.

@germdisco I actually do the same thing with SQL (do a SELECT statement, then only turn it into an UPDATE / DELETE after I see the data).

@germdisco Interesting, I didn't realize echo would expand the command like that. Nice tip.