Error: flag 'show-identical' cannot be repeated

I’m not sure why, but recently when I try to run:

kopia snapshot list --all

I get the error

kopia.exe: error: flag ‘show-identical’ cannot be repeated, try --help

Are you sure you used --all and not -all? As with the latter it is what happens as it means:
-a -l -l
which means:
--all --show-identical --show-identical.

I tried again and I must have had a typo, --all works.

And thank you, this is the first time I have understood the true meaning of ‘-’ vs. ‘–’, I wasn’t aware that ‘-’ offers passing multiple single character flags together!

I learnt it hard way too:) And your example can be truly confusing indeed.

Kopia is using typical Unix convention where -- is descriptive flag (e.g. --help) and - short flag version (e.g. -h). In addition several short options can be joined together, using only a single - prefix