Getting absolute path of a shell / bash script file in execution time
#!/bin/bash
# REFERENCE: http://stackoverflow.com/a/1638397/1260526
# Absolute path to this script, e.g. /home/user/bin/foo.sh
SCRIPT=$(readlink -f "$0")
# Absolute path this script is in, thus /home/user/bin
SCRIPTPATH=$(dirname "$SCRIPT")
echo $SCRIPTPATH