Terminal vs "do shell script" - different behaviour processing extended characters

Question

Åäö won't be processed correctly by shell command "tr" when triggered by AppleScript.
Result from Terminal (running shell "sh"):
sh-3.2$ echo "ABCabcÅÄÖåäö" | tr "[:lower:]" "[:upper:]";
Result: ABCABCÅÄÖÅÄÖ
sh-3.2$ echo "ABCabcÅÄÖåäö" | tr "[:upper:]" "[:lower:]";
Result: abcabcåäöåäö
Result when running AppleScript "do shell script" (natively using shell "sh"):
do shell script ("echo \"ABCabcÅÄÖåäö\" | tr \"[:lower:]\" \"[:upper:]\";")
Result: ABCABCÅÄÖåäö
do shell script ("echo \"ABCabcÅÄÖåäö\" | tr \"[:upper:]\" \"[:lower:]\";")
Result: abcabcÅÄÖåäö
I also tried a tip from another discussion - "/bin/echo" or "prinf" instead of just "echo".
- Same result.
Any suggestions how to overcome this?
/Martin

Answer 1

Hmm, thought you solved my problem but, sigh!, it seems the German Capital ß is a problem.
More of a linguistic problem though so, thanks a lot anyway!
http://en.wikipedia.org/wiki/Capital_ß
Lowercase => uppercase
Original lowercase
abcdefghijklmnopqrstuvwxyzßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýÿþœšÿ
Uppercase result using sh & tr in Terminal
ABCDEFGHIJKLMNOPQRSTUVWXYZßÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝŸÞŒŠŸ
Uppercase result using perl via applescript
ABCDEFGHIJKLMNOPQRSTUVWXYZSSÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝŸÞŒŠŸ
Difference: Lowercase ß => ß using sh but => SS using perl.
Uppercase => lowercase
Original uppercase
ABCDEFGHIJKLMNOPQRSTUVWXYZßÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝŸÞŒŠŸ
Lowercase result using sh & tr in Terminal
abcdefghijklmnopqrstuvwxyzßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýÿþœšÿ
Lowercase result using perl via applescript
abcdefghijklmnopqrstuvwxyzßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýÿþœšÿ
Difference: None.