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Exactly what I am looking for. However, the scripts are not running ksh93. I did run through a test cycle here on AIX 5.3, the results are below.

/test> cat a.sh
#!/bin/ksh93
echo "a: $0"...

The script is untouched as it migrates throught the life cycle regions with various file sub-systems, such as /common/dev, /common/test, and so on. Specific applications /app1 or /app2 will be...

Understand it completely.

Again, I was looking (hoping) for a $0 equivalent for the sourced file. I realize the $0 is the invoked script.

Thanks for the reponses, hopefully someone will...

Not really much help. The link tried to provide workarounds rather than answering the question. There are times when inside the script, it doesn't know what directory it is in. Seems like a $0...

Thanks for the response, but as you indicate at the end of your post, it only works when a and b are in the same directory. My useCase has to address the notion that a is in a different directory...

The sample scripts below, I am looking for the location of the sourced b.sh file. The b.sh file is source by multiple files, so it is not feasible to rely on a "global" variable or passed argument. ...