BASH

getDirectory.sh

#!/bin/bash

#
# Get directory of the shell script itself
#

# Read the directory where the shell script is in
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

# Or resolve the symlink of the file if there is any
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 )"

What's wrong with "$(dirname "$0")" ?