Making ẞ lowercase on MacOS bash

Question

I have a problem with lowercasing ß character on MacOS. In all tools which I use for lowercasing (gawk and tr, awk has problems with encoding) it is not lowercased at all. Other special characters are lowercased correctly. Could anyone have some solution for that?

Examples:

tr

echo üäößÜÄÖẞ | tr '[:upper:]' '[:lower:]'
üäößüäöẞ

gawk

echo üäößÜÄÖẞ | gawk '{print tolower($0)}'
üäößüäöẞ

Answer 1

Option 1: perl

echo 'üäößÜÄÖẞ' | perl -CSD -ne 'print lc'

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Option 2: tr

echo üäößÜÄÖẞ | tr ẞ ß

Because both ẞ and ß are completely 'different' characters, the common tools don't know the lowercase version.

As @Thilo suggested, you could use tr [option] stringValue1 [stringValue2] to tell tr to 'replace' ẞ with an ß

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