Add a pointer to "hg -v help" to the bottom of hg help {,cmd} output This should make it easier to discover global options. As a bonus, they are no longer displayed by something like a hg -v help dates

#!/bin/sh
# http://www.selenic.com/mercurial/bts/issue433

hg init a
cd a       
echo a > a 
hg commit -Ama 

hg parents -r 0 doesnotexist
true