* `env -u SOME_ALREADY_UNSET_VARIABLE' no longer dumps core on non-glibc systems
* fmt now diagnose invalid obsolescent width specifications like `-72x'
* fmt now exits nonzero when unable to open an input file
+* rm now works around Darwin6.5's broken readdir function; before `rm -rf DIR'
+ would fail to remove all files in DIR if there were more than 338.
* tail's byte and line counts are no longer limited to OFF_T_MAX.
Now the limit is UINTMAX_MAX (usually 2^64).
* tsort now fails when given an odd number of input tokens.