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Yash 2.48 breaks badly on Solaris when an ISO-8859-* locale is active and any high-byte characters are processed.

Test script:

set -x
sh -xc 'echo "XaYöb"'

case XaYöb in
( X*Y* ) echo ok; exit ;;
( *Y* ) echo yashbug; exit ;;
( * ) echo wrong; exit ;;
esac
echo WRONG2

To trigger the bug, run this on Solaris with something like: LANG=nl_NL.ISO8859-1 yash test.sh

Symptoms:

• The sh -xc command is traced but otherwise not executed. In general it seems like an external command is silently skipped if any of its arguments contain a high-byte character.
• The case pattern matches *Y* but not X*Y* as it should, so yashbug is output.

Whether this is a Solaris bug or a yash bug, I couldn't say. However, yash seems to be the only shell exhibiting these symptoms on Solaris.

FYI, Solaris VMs can be downloaded and used free of charge for the purposes of software development and testing. See: https://www.oracle.com/technetwork/server-storage/solaris11/downloads/vm-templates-2245495.html