This action is analogous
to defining a Windows environment variable with the Windows SET command.
One way to use the SET system option is to set up environment variables
that represent commonly used external files. For example, the following
code defines an environment variable for the sample source library:
-set sampsrc (!sasroot\base\sample
!sasroot\stat\sample
!sasroot\graph\sample)When you refer to SAMPSRC
as a library name during your SAS session, SAS automatically assigns
the library with the directories listed. Note that !
sasroot is also a SAS environment variable that
represents the root directory of your SAS installation, and is typically
assigned in the SAS configuration file.
Environment variables
only can be used as a libref if you use the SET system option at SAS
invocation and not in an OPTIONS statement.
If you specify SET on
the command line when you start SAS, the variable will be set only
for that SAS session. To set an environment variable for repeated
use, either add the SET system option to your configuration file or
create a Windows environment variable.
You can use the APPEND
and INSERT system options to add additional file specifications.
Note: The words AUX, CON, NUL,
LPT1 - LPT9, COM1 - COM9, and PRN are reserved words under Windows.
Do not use CON or NUL as environment variable names.