git-churn.sh

#!/bin/sh
#
# Originally written by Corey Haines
# Scriptified by Gary Bernhardt
#
# Tweaked by me, @dotemacs:
# - changed it from Bash to Bourne shell
# - made the files with most churn print first
# - improved the sort/uniq flow
#
# Show churn for whole repo:
#   $ git churn
#
# Show churn for specific directories:
#   $ git churn app lib
#
# Show churn for a time range:
#   $ git churn --since='1 month ago'
#
# (These are all standard arguments to `git log`.)

set -e
git log --all -M -C --name-only --format='format:' "$@" | \
grep -v '^$' | sort | uniq -c | sort -rn | \
awk 'BEGIN {print "count\tfile"} {print $1 "\t" $2}'