Store the scripts folder in a variable

mydir.sh

#!/bin/bash

# Finding out which script-folder your bash-script runs in can be problematic.
# Here is a quick solution that tries to be cross-platform and support every odd-cases. Like if your script is runned via a symlink.

mydir=$(cd $(dirname $(readlink -f "${BASH_SOURCE:-$0}"));pwd)
cd ${mydir}