script_dir.sh

#!/bin/bash

# Simple form
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

# More correct/robust form, if you have time
SOURCE="${BASH_SOURCE[0]}"
while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink
  DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
  SOURCE="$(readlink "$SOURCE")"
  [[ $SOURCE != /* ]] && SOURCE="$DIR/$SOURCE" # if $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located
done
DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"

# Most compatible, if not 100% correct all the time:
DIR=`dirname $0`