creating a git repo with many references

#!/bin/bash

#brew install gun-time for Mac
for (( i=1; i<=200000; i++))
	do
    filename=`cat /dev/urandom | env LC_CTYPE=C tr -cd 'a-f0-9' | head -c 32`
    folder=`cat /dev/urandom | env LC_CTYPE=C tr -cd 'a-f0-9' | head -c 2`
    mkdir -p $folder
    base64 /dev/urandom | head -c 100000 > $folder/$filename.txt
    git add  $folder/$filename.txt
    gtime -o stat.txt -a  -f "%U|%S" git commit . -m"for $filename.txt"
    echo $i
  done;