How to check if there’s nothing to be committed in the current branch?

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The goal is to get an unambiguous status that can be evaluated in a shell command.

I tried git status but it always returns 0, even if there are items to commit.

git status
echo $?  #this is always 0

I have an idea but I think it is rather a bad idea.

if [ git status | grep -i -c "[a-z]"> 2 ];
then
 code for change...
else
  code for nothing change...
fi

any other way?

update with following solve, see Mark Longair’s post

I tried this but it causes a problem.

if [ -z $(git status --porcelain) ];
then
    echo "IT IS CLEAN"
else
    echo "PLEASE COMMIT YOUR CHANGE FIRST!!!"
    echo git status
fi

I get the following error [: ??: binary operator expected

now, I am looking at the man and try the git diff.

===================code for my hope, and hope better answer======================

#if [ `git status | grep -i -c "$"` -lt 3 ];
# change to below code,although the above code is simple, but I think it is not strict logical
if [ `git diff --cached --exit-code HEAD^ > /dev/null && (git ls-files --other --exclude-standard --directory | grep -c -v '/$')` ];
then
        echo "PLEASE COMMIT YOUR CHANGE FIRST!!!"
    exit 1

else
    exit 0
fi

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