I use the term “freedom units” whether someone tells me that they’re 6 shoes and 2 toenails tall instead of using metric.

By not testing it properly before running it over the whole file system resulting in a few hours of extra work cleaning up the mess I made.

Very true. I used to do magic with xargs when working as a sysadm. Also a good way to mess up on a grand scale. Ask me how I know.