Syncing multiple upstream bash scripts.

githubrepos.txt

Aerial master
Pi_Servo_Hat master
RPi_Cam_Web_Interface master
RPi_PanTilt_Camera_Kit master
tensorflow/docs-l10n master
covid19 development
covid19-saitama development
aiyprojects-raspbian aiyprojects

sync_upstream.sh

#!/usr/bin/env bash

sync_upstream()
{
  cd $1
  pwd
  # echo $2
  git fetch upstream
  git merge upstream/$2
  git push
  cd -
}

while read repo default
do
  sync_upstream $repo $default
done < githubrepos.txt

These are to sync upstream repositories script.
Please edit 'githubrepos.txt' for your repositories.
The first is repository's name, the second is default branch name.
You may separate a space.
Enjoy!