Sets up git authentication (for github) automatically

auth.sh

# Install GitHub CLI
GH=$HOME/.local/bin/gh
command -v gh
if [ "$(command -v gh)" ]; then
  # GitHub CLI is globally installed
  GH="$(which gh)"
elif [ -f "$GH" ]; then
  # GitHub CLI is locally installed
  echo "already installed"
else
  # GitHub CLI needs to be installed
  VERSION=`curl "https://api.github.com/repos/cli/cli/releases/latest" | grep '"tag_name"' | sed -E 's/.*"([^"]+)".*/\1/' | cut -c2-`
  curl -sSL https://github.com/cli/cli/releases/download/v${VERSION}/gh_${VERSION}_linux_amd64.tar.gz -o gh_${VERSION}_linux_amd64.tar.gz
  tar xvf gh_${VERSION}_linux_amd64.tar.gz
  mkdir $HOME/.local/bin
  mv gh_${VERSION}_linux_amd64/bin/gh $HOME/.local/bin/
  rm -rf gh_${VERSION}_linux_amd64
  rm gh_${VERSION}_linux_amd64.tar.gz
  echo "alias gh='${GH}'" >> $HOME/.bashrc
  source ~/.bashrc
fi

# Authenticate through GitHub CLI and get username
`$GH auth login`
GITUSERNAME=`$GH api user | grep -oE '"login":"[^,]+"' | sed -E 's/.*"([^"]+)".*/\1/'`

# Setup git credentials
`$GH auth setup-git`
git config --global user.name $GITUSERNAME
git config --global user.email ${GITUSERNAME}@github.com

Usage:

wget https://gist.githubusercontent.com/Vac1911/36571699986bbc440857a2602e14331c/raw/a1f6afa8ae203e902e9978f6da7585c5779c5770/auth.sh
chmod +x auth.sh
./auth.sh