Universal way to find out scripts BASEDIR. Can be used as base for sourcable 'profile' to alter current environment for particular use (e.g. cross-compiler environment).

profile

if [ "${0#/*profile*}" != "${0}" ]
then
    BASEDIR=$(dirname "$(readlink -f "$0")")
else
    if [ $# -gt 0 -a "${1#/*profile*}" != "${1}" ]
    then
        BASEDIR=$(dirname "$(readlink -f "$1")")
    else
        echo 'NOTE: When sourcing this profile on some shells (e.g. Busybox) you need to profile file name twice.'
        echo 'Usage: . path/to/profile path/to/profile'
        echo
        return
    fi
fi
echo '${BASEDIR}: '$BASEDIR