Find and cautiously update multiple git repositories. Base: http://stackoverflow.com/q/11981716/15031

_repos.sh

#!/bin/bash
# Update all git repositories under the current or specified directory

OPTIND=1

usage=0
list=0
update=0
forced=0

while getopts "h?l?u?f?" opt; do
  case "$opt" in
    h|\?)
      usage=1
      ;;

    l)
      list=1
      ;;

    u)
      update=1
      ;;
    f)
      forced=1
      ;;
  esac
done

if [ $usage = 1 ] || [ "$#" = "0" ]; then
  echo "Usage: $0 [-h? | -l | -ufv] -- path" 1>&2
  exit 1
else
  shift `expr $OPTIND - 1`
fi

function update {
  if [ -d "$1" ]; then
    cd $1 > /dev/null

    if [ -d ".git" ]; then
      printf '\e[0;33m%s: \e[0;34m%s \e[0m\n' 'Updating' $1

      local edits=$(git status --porcelain | grep -iEc '^ ?[a-z]')
      local latest=$(git rev-parse HEAD)

      git status -s

      if [ $edits -eq 0 ] || [ $forced = 1 ]; then
        git fetch -p
        git pull

        local updated=$(git rev-parse HEAD)

        if [ $latest != $updated ]; then
          echo ''
          git --no-pager log --reverse --format='%h (%ar, %an) %s' "$latest..$updated"
        fi

        echo ''
      fi

      git gc --auto

      echo ""

    else
      echo "$1 is not a git repo"
    fi

    cd - > /dev/null
  fi
}

function scan {
  local base=$([ "$1" != "" ] && echo "$1" || echo ".")

  echo "Searching: $base"

  for repo in `find "$base" -name .git -type d`; do
    local wd=`dirname "$repo"`

    if [ $list = 1 ]; then
      echo "$wd"
    elif [ $update = 1 ]; then
      update "$wd"
    fi
  done
}

scan "$1"