Question:
DIR_SAPUSERS -->".\"
DIR_TEMP --> "."
These two directories of sap applition server is relative path, but how can I get the absolute path?
Answer:
Your active directory should be . (dot). Your active directory from within SAP should also be DIR_HOME. In your case it seems that both given directories are equal to DIR_HOME.
Answer:
I have made a interface between sap and other system, so data file from other system write into sap application server directory, then sap background periodic job will read data from this file, the question is where directory for other system to write?
Answer:
DIR_HOME is your default directory if you use just the file name in OPEN, READ DATASET.
You can see the physical directory for DIR_HOME in AL11.
Be careful if you have several application servers though, use a shared directory or direct background job to a specific server.