Update master in all git repo under the provided directory or if missing uses running directory.

git-refresh.sh

#!/bin/sh
GITROOT="${1:-.}"
find $GITROOT -name .git -type d | cat -n | while read n f
do
    cd "$(dirname "$f")"
    GITDEFBR="$(git symbolic-ref refs/remotes/origin/HEAD | sed 's@^refs/remotes/origin/@@')"
    GITPROJ="$(pwd -P)"
    echo "\033[32m>>> \033[1m$GITPROJ\033[0m\033[21m"
    GITBRANCH=$(git rev-parse --abbrev-ref HEAD)
    git add .
    echo "> Saving local changes: $(git stash)"
    if [ ! "$GITBRANCH" = "$GITDEFBR" ]
    then
        echo "> Swithing to '$GITDEFBR'"
        git checkout $GITDEFBR &>/dev/null
    fi
    echo "> Fetching latest from repo: $(git pull --rebase)"
    echo '> Cleaning up unnecessary files and optimizing the local repository'
    git clean -df
    echo '> Prunning all unaccessible objects'
    git gc --aggressive
    git remote prune origin
    if [ ! "$GITBRANCH" = "$GITDEFBR" ]
    then
        echo "> Swithing back to '$GITBRANCH'"
        git checkout $GITBRANCH &>/dev/null
    fi
    if [ ! "$(git stash list)x" = 'x' ]
    then
        echo '> Restoring previous saved changes.'
        git stash pop
        git reset HEAD .
    fi
    cd - &>/dev/null
done