* su fails gracefully when getpass is unable to open /dev/tty.
* printenv and tty detect and report write errors
* fix bug in stty
-* stty supports accepts the new options status and flush on systems that
- provide them
-* fix bugs in expr
+* stty accepts the new options status and flush on systems that provide them
+* `expr 1 / 0' gives an error message rather than trying to divide by zero
+* expr's `substr' doesn't overrun malloc'd buffer
+* expr recognizes the string `0' as zero
* better support for Linux, Dec Alpha, and SGI Irix
* all programs (even true and false) accept --version and --help options
* uname's --version option is no longer equivalent to its -v option