This file is indexed.

/usr/bin/git-back 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.

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#!/bin/sh

if test $# -eq 0; then
  git reset --soft HEAD~1
else
  if `echo $1 | grep -q [^[:digit:]]`; then
    echo "$1 is not a number" 1>&2
  else
    git reset --soft HEAD~$1
  fi
fi