How to use beyond compare to show difference between commited files in local git repository and modified files?

For me it was enough to run next commands from git bash:

$git config --global diff.tool bc3

$git config --global difftool.bc3.path C\:/Program\ Files\ \(x86\)/Beyond\ Compare\ 3/BCompare.exe

$git config --global difftool.prompt false

Then you can use difftool command to see differences for each file which is modified:

$git difftool