Bash script: set current working directory to the directory of the script

Question

I'm writing a bash script (extremely unpleasant experience, as always) and I need the current working directory to act sanely. When I run the script from the directory in which it is in, it's fine. However, when I run it from somewhere else, the current working directory is for some reason propagated to the script. This is obviously undesirable. The claimed solutions, e.g. here, don't work; in any case I refuse to believe that it's that complicated to do something so simple.

Answer 1

BASH FAQ entry #28

Answer 2

This script seems to work for me:

#!/bin/bash
mypath=`realpath $0`
cd `dirname $mypath`
pwd

The pwd command line echoes the location of the script as the current working directory no matter where I run it from.

Answer 3

#!/bin/bash
cd "$(dirname "$0")"

Answer 4

Get the real path to your script

if [ -L $0 ] ; then
    ME=$(readlink $0)
else
    ME=$0
fi
DIR=$(dirname $ME)

(This is answer to the same my question here: http://stackoverflow.com/questions/3373132/get-name-of-directory-wher-script-is-executed)