Previously, mksh did not handle trace output correctly. Due to this problem, mksh aborted unexpectedly when the tracing was enabled and a long string was to be reported, This update improves the long trace output handling. Now, long trace output is successfully printed without interruption. (BZ#616771)

Previously, mksh did not handle aliases that contained aliases correctly. Due to this problem, mksh aborted when double aliases were used. This update corrects the alias handling code. Double aliases are handled as expected. (BZ#616777)

Previously, bad substitution could abort mksh unexpectedly because of a conflict between acceptable code for ksh-88 and ksh-93. This update recognizes both code types and prints errors as expected. (BZ#618274)

Previously, users had to change the shebang in their ksh-88 scripts or port their scripts to ksh-93. This update adds the "alternatives" switching method that allows to switch between ksh-93 provided by the ksh package and ksh-88 provided by the mksh package for /bin/ksh. Now, users can apply their scripts without modification or porting them to ksh-93 one by one. (BZ#659668)