Here are some useful git command for bash scripting

Uncommited Changes:

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if ! git diff-index --quiet HEAD --; then
	echo "There are uncommited changes on this repository."
	exit 1
fi

Remote exists:

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git remote -v | /usr/bin/awk '{print $1}' | /usr/bin/grep -w ${ORIGIN_REMOTE} >/dev/null 2>&1
if [ $? -ne 0 ]; then
    echo "Do not have remote: ${ORIGIN_REMOTE}\n"
    exit 1
fi

Local Branch Exists:

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git rev-parse -q --verify ${branch} >/dev/null 2>&1
if [ $? -ne 0 ]
then
    echo "Branch ${branch} exists"
fi