Update all tracking Git branches

git-sync-track.zsh

#!/usr/bin/env zsh

ORIG_BRANCH="$(git rev-parse --abbrev-ref HEAD)"
if [[ "$ORIG_BRANCH" == "HEAD" ]] {
    ORIG_BRANCH="$(git rev-parse --short HEAD)"
}

for b in $(git branch --track | grep -v 'detached' | sed 's/*//')
do
    git checkout "${b}"
    git rev-parse --abbrev-ref @{u} && git merge --ff-only
    echo
done
LAST_BRANCH="$(git rev-parse --abbrev-ref HEAD)"

if [[ "$ORIG_BRANCH" != "$LAST_BRANCH" ]] {
    git checkout --quiet "$ORIG_BRANCH"
}