Reserved Filerefs in UNIX Environments

The following filerefs are reserved.
DATALINES fileref in the INFILE statement
specifies that input data immediately follow a DATALINES statement. You need to use INFILE DATALINES only when you want to specify options in the INFILE statement to read instream data.
LOG fileref in the FILE statement
specifies that output lines produced by PUT statements be written to the SAS log. LOG is the default destination for output lines.
PRINT fileref in the FILE statement
specifies that output lines produced by PUT statements be written to the same print file as output produced by SAS procedures.