Here's the problem. When you change the default behavior of existing commands, you're not only changing the configuration of one computer. You're changing your own behavior as a user. So whenever you're using someone else's computer (and don't assume that you won't) you constantly have to fight the habits formed by using altered commands on your own computer.

That's why you should only create new commands instead of redefining existing ones. If you accidently "rm wrongfile" on someone else's computer, you've just lost their data. However if you "trash wrongfile" you've only entered an unrecognized command.


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