How do I get the script location from within my script when it runs even if executed from elsewhere?

I have a script (./start.sh) which can be run from anywhere in a Docker container. 

How does this script determine its absolute path, regardless of the executing script's location and without pre-defining this parameter in the code?

I have tried `dirname $0` but that did not work.

If I use $(pwd) that is only the working directory and it some times does not work.

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Here's what I found that works:

RUN_DIR=$(pwd $(dirname $0))/

You could also use this:

pushd `dirname $0` > /dev/null
SCRIPTPATH=`pwd`
popd > /dev/null

(source: http://stackoverflow.com/questions/4774054/reliable-way-for-a-bash-script-to-get-the-full-path-to-itself)

But the first seems a lot cleaner.

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