git reset HEAD --hard

gistfile1.txt

milki@dashi:/tmp/docu$ touch a; git add a; git status
On branch master
Changes to be committed:
  (use "git reset HEAD <file>..." to unstage)

	new file:   a

milki@dashi:/tmp/docu$ git reset HEAD --hard; git status
HEAD is now at 49c9f9d init
On branch master
nothing to commit, working directory clean

milki@dashi:/tmp/docu$ touch a; git add a; git status
On branch master
Changes to be committed:
(use "git reset HEAD ..." to unstage)

new file:   a

soft reset:

milki@dashi:/tmp/docu$ git reset HEAD; git status
On branch master
Untracked files:
(use "git add ..." to include in what will be committed)

a

nothing added to commit but untracked files present (use "git add" to track)

milki@dashi:/tmp/docu$ git --version
git version 2.6.2