==== rev ====
LC_ALL=C rev /home/src/regress/usr.bin/rev/in.txt > out.ascii.txt
diff -u /home/src/regress/usr.bin/rev/exp.ascii.txt out.ascii.txt
LC_ALL=en_US.UTF-8 rev /home/src/regress/usr.bin/rev/in.txt > out.utf8.txt
diff -u /home/src/regress/usr.bin/rev/exp.utf8.txt out.utf8.txt