Stashing Only Unstaged Changes

If you have both staged and unstaged changes in your project, you can perform a stash on just the unstaged ones by using the -k flag. The staged changes will be left intact ready for a commit.

$ git status
On branch master
...
Changes to be committed:

    modified:   README.md

Changes not staged for commit:

    modified:   app/models/user.rb

$ git stash -k
Saved working directory and index state ...

$ git status
On branch master
...
Changes to be committed:

    modified:   README.md

h/t Chris Erin