Git resync fork from upstream with branches

#!/bin/bash
## Checkout all branches from remote as tracking branches. Based on    https://stackoverflow.com/questions/379081/track-all-remote-git-branches-as-local-branches/6300386#6300386

UPSTREAM=$1
MYREPO=$2

MASTERBRANCHNAME="master"

usage() {
   echo "Usage:"
   echo "$0 <upstream-remote> <target-remote>"
   echo ""
   echo "Example which ensures remote named 'maxandersen' have all the same branches and tags as 'origin'"
   echo "$0 upstream origin"
   exit 1
}

if [ -z "$UPSTREAM" ]
then
echo Missing upstream remote name.
usage
fi

if [ -z "$MYREPO" ]
then
echo Missing target remote name.
usage
fi

git fetch $UPSTREAM

for brname in `git branch -r | grep "$UPSTREAM" | grep -v $MASTERBRANCHNAME | grep -v HEAD | sed -e 's/.*\///g'`; do git branch --track $brname  $UPSTREAM/$brname ; done
git push --all $MYREPO
git push --tags $MYREPO