update-all-git-repos.sh

#!/bin/bash
# Run this script while in the directory that has all your cloned repos
# The script should also be located in the same directory (together
# with all your repos)
test "$(pwd)" = "$(realpath $(dirname $0))" ||
  (
    echo "You're in the wrong directory :-(" >&2
    exit 9
  )

set $(ls -l | awk '/^d/ {print $NF}' | xargs)

for repo in $@; do
  pushd $repo > /dev/null
  IN_BRANCH=0
  if [ -d $repo/.git ]; then
    current_branch="$(git status | awk 'NR==1 {print $NF}')"
    test "$current_branch" = "master" || IN_BRANCH=1
    [ $IN_BRANCH -eq 1 ] && git checkout master > /dev/null
    git pull > /dev/null && echo Repo $repo updated.
    [ $IN_BRANCH -eq 1 ] && git checkout -
  fi
  popd > /dev/null
done