Alias 'mainup' for Updating and Keeping 'main' Branch Up-to-Date While on Working Branch

Git alias to update main branch in one step

# Set up a Git alias called 'mainup' that updates the 'main' branch and brings it up-to-date while staying on the current working branch  
  
# Run the following command to set up the alias:  
git config --global alias.mainup '!git rev-parse --abbrev-ref HEAD > .git/CURRENT_BRANCH && git checkout main && git pull && git checkout $(cat .git/CURRENT_BRANCH) && rm .git/CURRENT_BRANCH'  
  
# Now you can update the 'main' branch and bring it up-to-date while staying on your working branch by running the 'mainup' command:  
git mainup