It fails with error:
error: unknown switch `U' usage: git remote add [] -f, --fetch fetch the remote branches --tags import all tags and associated objects when fetching or do not fetch any tag at all (--no-tags) -t, --track branch(es) to track -m, --master master branch --mirror[=(push|fetch)] set up remote as a mirror to push to or fetch from
It fails with error: error: unknown switch `U' usage: git remote add [] -f, --fetch fetch the remote branches --tags import all tags and associated objects when fetching or do not fetch any tag at all (--no-tags) -t, --track branch(es) to track -m, --master master branch --mirror[=(push|fetch)] set up remote as a mirror to push to or fetch from