git-stats.sh

# avg number of commits per month in date range
input_start=2017-3-1
input_end=2017-9-1

startdate=$(date -I -d "$input_start") || exit -1
enddate=$(date -I -d "$input_end")     || exit -1

d="$startdate"
sum=0
count=0
while [ "$d" != "$enddate" ]; do 
  part=0
  echo $d
  
  part=`git rev-list master  --count --before={$(date -I -d "$d + 1 month")} --after={$d}`
  echo $part
  d=$(date -I -d "$d + 1 month")
  sum=$(($sum + $part))
  count=$(($count + 1))
done

echo $(($sum / $count))  

git-user-activity.sh

# number of days beetwen first and last comit of a user
mapfile -t authors < <( git log --pretty=format:%an | sort | uniq )
echo "Number of authors:" ${#authors[@]}

for author in "${authors[@]}"
do
  lastCommitDate=`git log --pretty=format:%at --author="$author" | sed -n 1p`
  firstCommitDate=`git log --pretty=format:%at --author="$author" | tail -1`
  
  if [ ! -z "$lastCommitDate" ]; 
  then
    daysInProject=$((($lastCommitDate - $firstCommitDate)/60/60/24))	
    echo $author"	"$daysInProject
  fi

done

git-user-stats.sh

# avg number of commiters per month in date range
input_start=2017-3-1
input_end=2017-9-1

startdate=$(date -I -d "$input_start") || exit -1
enddate=$(date -I -d "$input_end")     || exit -1

d="$startdate"
sum=0
count=0
while [ "$d" != "$enddate" ]; do 
  part=0
  echo $d
  
  part=`git shortlog -s -n --before={$(date -I -d "$d + 1 month")} --after={$d} | wc -l`
  echo $part
  d=$(date -I -d "$d + 1 month")
  sum=$(($sum + $part))
  count=$(($count + 1))
done

echo $(($sum / $count))