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http://support.sas.com/techsup/technote/ts673.html

DSD
(Delimiter-Sensitive Data) It has three functions when reading delimited files. The first function is to strip off any quotes that surround values in the text file. The second function deals with missing values. When SAS encounters consecutive delimiters in a file, the default action is to treat the delimiters as one unit. If a file has consecutive delimiters, it’s usually because there are missing values between them. DSD tells SAS to treat consecutive delimiters separately; therefore, a value that is missing between consecutive delimiters will be read as a missing value when DSD is specified. The third function assumes the delimiter is a comma. If DSD is specified and the delimiter is a comma, the DLM= option is not necessary. If another delimiter is used, the DLM= option must be used as well.
LRECL=
(Logical Record Length) This option should be used when the length of the records in a file are greater than 256 bytes (on ASCII platforms). The input buffer is 256 bytes by default, and records that are greater than this length will be truncated when they are read. Setting the LRECL= option to a greater length assures that the input buffer is long enough to read the whole record.
FIRSTOBS=
This option indicates that you want to start reading the input file at the record number specified, rather than beginning with the first record. This option is helpful when reading files that contain a header record, since a user can specify FIRSTOBS=2 and skip the header record entirely.

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Last-modified: 2007-01-19 (金) 09:08:52 (4658d)