| File I/O Functions | 
| ATTRC | returns the value of a character attribute for a SAS data set | 
| ATTRN | returns the value of a numeric attribute for the specified SAS data set | 
| CEXIST | verifies the existence of a SAS catalog or SAS catalog entry and returns a value | 
| CLOSE | closes a SAS data set and returns a value | 
| CUROBS | returns the observation number of the current observation | 
| DROPNOTE | deletes a note marker from a SAS data set or an external file and returns a value | 
| DSNAME | returns the SAS data set name that is associated with a data set identifier | 
| EXIST | verifies the existence of a SAS data library member | 
| FETCH | reads the next nondeleted observation from a SAS data set into the Data Set Data Vector (DDV) and returns a value | 
| FETCHOBS | reads a specified observation from a SAS data set into the Data Set Data Vector (DDV) and returns a value | 
| GETVARC | returns the value of a SAS data set character variable | 
| GETVARN | returns the value of a SAS data set numeric variable | 
| LIBNAME | assigns or deassigns a libref for a SAS data library and returns a value | 
| LIBREF | verifies that a libref has been assigned and returns a value | 
| NOTE | returns an observation ID for the current observation of a SAS data set | 
| OPEN | opens a SAS data set and returns a value | 
| PATHNAME | returns the physical name of a SAS data library or of an external file, or returns a blank | 
| POINT | locates an observation identified by the NOTE function and returns a value | 
| REWIND | positions the data set pointer at the beginning of a SAS data set and returns a value | 
| SYSMSG | returns the text of error messages or warning messages from the last data set or external file function execution | 
| SYSRC | returns a system error number | 
| VARFMT | returns the format assigned to a SAS data set variable | 
| VARINFMT | returns the informat assigned to a SAS data set variable | 
| VARLABEL | returns the label assigned to a SAS data set variable | 
| VARLEN | returns the length of a SAS data set variable | 
| VARNAME | returns the name of a SAS data set variable | 
| VARNUM | returns the number of a variable’s position in a SAS data set | 
| VARTYPE | returns the data type of a SAS data set variable |