bash scripts: how to determine directory of 'source'd file

From: michael <linux@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 31 Jan 2006 14:26:27 +0000

Presuming I have a file setEnvVars.sh that I wish to source,
. path/setEnvVars.sh
How do I, within the script, determine the actual directory within which
the setEnvVars.sh file sits? The sourcing seems to disallow me access to
$0 etc

thanks, M

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