How to expand relative paths in shell script

Question

I am writing a script to set environment variables on linux 2.6 using bash. So the script contains commands like:

export SRC_DIR=..
export LIBPATH=${SRC_DIR}/lib         


        

Answer 1

I usually use

SCRIPT_DIR=$(readlink -f ${0%/*})

It should return the full path to the script, and even resolves all the links along the way.