Help creating script that mass-pulls Git(Hub) repos

Hi,

I got a bunch of repos I've cloned off GitHub and I'm looking for the best way to keep them all up to date.

I got a working zsh script, but it lacks some stuff. For instance I think it'd be neat if it could output the difference between the commit dates as oppose to those long hashes. And if it could initiate the pull only when necessary. Other ideas are welcome.

Does anybody have any suggestions to how I might complete or otherwise improve the below scripts? Thanks in advance.

Here's the working version:

abletony84$ cat pull_all.sh

#!/usr/bin/env zsh

for folder in $PWD/**/.git(:h); do

  cd $folder

  git pull

done

-

This script lacks a proper if clause, and shows hashes instead of dates:

abletony84$ cat pull_all2.sh

#!/usr/bin/env zsh

for folder in $PWD/**/.git(:h); do

  cd $folder

  if this repo needs an update; then # git ls-remote has been suggested

    old=$(git rev-parse HEAD)

    git pull >& /dev/null

    new=$(git rev-parse HEAD)

    echo "$folder: $old -> $new"

  else

    echo "$folder: nothing to do"

  fi

done

-

A slightly different approach, even more incomplete than the previous:

abletony84$ cat pull_all3.sh

#!/usr/bin/env zsh

for folder in $PWD/**/.git(:h); do

  cd $folder

  if repo still exists at github; then

    git fetch >& /dev/null

    if a merge is needed; then

      git merge >& /dev/null

      echo "$folder: date_of_last_current_commit -> date_of_last_new_comit"

    else

      echo "$folder: nothing to do"

    fi

  fi

done

-

Thanks again!

Tony