du: error: the argument '--human-readable' cannot be used multiple times (but works in GNU)

Hi,

To reproduce:

du -h -h

or:

alias du='du -h'
du -h

(I have this setup on most machines, but my muscle memory still contains -h...)

Actual output:

error: the argument '--human-readable' cannot be used multiple times

Expected output (for example):

0

GNU coreutils accepts multiple idempotent arguments. uutils should do the same.

I noticed there are a few bugs on this theme, many from 2020/2021, and in fact du itself has many arguments which should be accepted multiple times (e.g. --si, -s, -x, -c etc.) In fact almost all arguments can be safely passed multiple times with no ambiguity.

Do you want a separate bug for each argument, or each tool, or something else?

Thanks!
Bruce

Start by reproducing the issue with du -h -h and the alias example, then locate the du argument parsing entry point. Done means repeated idempotent options such as --human-readable no longer produce an error and the command matches the expected output; no file or test is named in the issue.