Analyzing Your SAS Session with the SAS Log

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Automatic variables: Diagnosing and Avoiding Errors discusses the automatic variables _N_ and _ERROR_.
FILE and PUT statements: Understanding and Customizing SAS Output: The Basics discusses the FILE and PUT statements.
The Log window: Using the SAS Windowing Environment discusses the Log window.
Operating environment-specific information: The SAS documentation for your operating environment contains information about the appearance and destination of the SAS log, as well as for routing output.
The SAS environment: Introducing the SAS Environment provides information about methods of operation and on specifying SAS system options when you invoke SAS. It also discusses executing SAS statements automatically.
The SAS log: SAS Language Reference: Concepts provides complete reference information about the SAS log.
SAS statements: SAS Language Reference: Dictionary provides complete reference information about the SAS statements that are discussed in this section.
SAS system options: SAS Language Reference: Dictionary provides complete reference information about SAS options that work across all operating environments. Refer to the SAS documentation for your operating environment for information about operating environment-specific options.
Your SAS session: Other sections provide more information about your SAS session. See especially Diagnosing and Avoiding Errors, which contains more information about error messages.