/usr/bin/gitxgrep is in gnuit 4.9.5-3build1.
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
#! /bin/sh cd "$1" echo `pwd`'/:' "$2" $3 $4 $5 $6 $7 $8 $9 2> /dev/null