remove a local copy of a remote branch and checkout the latest version

git-recheckout.sh

#!/bin/sh
#source "$(git --exec-path)/git-sh-setup"
targetBranch="$1"
# get current branch to return to it
branch=$(git branch | sed -n -e 's/^\* \(.*\)/\1/p')
# if current branch is target
if [ "$branch" = "$targetBranch" ]; then
  if [ "--force" != "$2" ]; then
    echo "Error: you try to recheckout current branch. Use --force"
    exit 1
  fi
  # move to lates commit of origin (detached head)
  commit=$(git rev-parse --verify origin/$targetBranch)
  echo checkout $commit
  git checkout $commit --quiet
fi
git branch -D $targetBranch
git fetch --prune
git checkout $targetBranch

usage:

git recheckout master --force