XMM-Newton Science Analysis System: User Guide


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Next: 2.8 SAS input and output files Up: 2 Analysis of XMM-Newton data: an overview Previous: 2.6 Running a SAS task from the command line


2.7 General settings affecting all SAS tasks

On a given SAS session, the SAS environment variables define the way in which SAS commands are executed. Several of these environment variables are part of the SAS initialization (e.g. SAS_DIR and SAS_PATH), others are optional.

The following is a description of some of the most useful environment variables in SAS:

The SAS tasks produce error messages at levels called message, warning, error and fatal.

Error messages are characterized by a layer and a verbosity level. The layer indicates the layer in the system where the message is coming from (e.g. application, user interface, application library or system library). The verbosity level determines whether or not the message will be reported. The user can specify the verbosity level. If the verbosity of a message is large enough compared to the system verbosity level, the message will be reported. The verbosity level differs for the different layers.


next up previous contents
Next: 2.8 SAS input and output files Up: 2 Analysis of XMM-Newton data: an overview Previous: 2.6 Running a SAS task from the command line
European Space Agency - XMM-Newton Science Operations Centre