[bash] Determine the path of the executing BASH script

Possible Duplicate:
Can a Bash script tell what directory it's stored in?

In a Windows command script, one can determine the directory path of the currently executing script using %~dp0. For example:

@echo Running from %~dp0

What would be the equivalent in a BASH script?

Vlad's code is overquoted. Should be:

MY_PATH=`dirname "$0"`
MY_PATH=`( cd "$MY_PATH" && pwd )`

Assuming you type in the full path to the bash script, use $0 and dirname, e.g.:

#!/bin/bash
echo "$0"
dirname "$0"

Example output:

$ /a/b/c/myScript.bash
/a/b/c/myScript.bash
/a/b/c

If necessary, append the results of the $PWD variable to a relative path.

EDIT: Added quotation marks to handle space characters.

Contributed by Stephane CHAZELAS on c.u.s. Assuming POSIX shell:

prg=$0
if [ ! -e "$prg" ]; then
  case $prg in
    (*/*) exit 1;;
    (*) prg=$(command -v -- "$prg") || exit;;
  esac
fi
dir=$(
  cd -P -- "$(dirname -- "$prg")" && pwd -P
) || exit
prg=$dir/$(basename -- "$prg") || exit 

printf '%s\n' "$prg"

echo Running from `dirname $0`