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

[michael]

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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