/usr/bin/git-count is in git-extras 1.9.1-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #!/bin/sh
if test "$1" = "--all"; then
git shortlog -n -s $@ | awk '{print substr($0,index($0,$2)) " (" $1 ")"}'
echo
fi
echo total `git rev-list --count HEAD`
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