gistfile1.sh

#!/bin/bash

# For the duration of this script, don’t run .rvmrcs
unset rvm_project_rvmrc

orig_pwd=$PWD

find . -name '*.git' -type d | while read repo; do
  # Starts a subshell, and thereby resetting pwd every time
  cd "$orig_pwd/$repo"
  pwd

  du -sch . | tail -n 1 | cut -f 1
  git gc --quiet
  du -sch .| tail -n 1 | cut -f 1

  echo
done