Merge pull request #102 from Heather/master

move tty to UNIX_PROGS

Makefile

@@ -28,13 +28,13 @@ PROGS       := \
   truncate \
   wc \
   yes \
-  tty \
   hostname \
   head \
 
 UNIX_PROGS := \
   users \
   whoami \
+  tty \
   id
 
 ifneq ($(OS),Windows_NT)

du/du.rs

@@ -141,7 +141,7 @@ fn main() {
         // In main
         getopts::optopt("", "time-style", "show times using style STYLE:
             full-iso, long-iso, iso, +FORMAT FORMAT is interpreted like 'date'", "STYLE"),
-        getopts::optflag("h", "help", "display this help and exit"),
+        getopts::optflag("", "help", "display this help and exit"),
         getopts::optflag("V", "version", "output version information and exit"),
     ];