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lang-bash
string="łódź"; echo ${string~~}will return "ŁÓDŹ", butecho ${string^^}returns "łóDź". Even inLC_ALL=pl_PL.utf-8. That's using bash 4.2.24.en_US.UTF-8. It's a bug and I've reported it.echo "$string" | tr '[:lower:]' '[:upper:]'. It will probably exhibit the same failure. So the problem is at least partly not Bash's.