In the following program, five raw data files, Route1.dat, Route2.dat, Route3.dat, Route4.dat, and Route5.dat, are concatenated to create the SAS data set Work.NewRoute. The names of the raw data files are stored in the SAS data set Sasuser.Rawdata, which is referenced using a SET statement. The name of the FILEVAR= variable, Readit, is the name of the variable in Sasuser.Rawdata whose value is the name of the file to be read.

data work.newroute;
  set sasuser.rawdata;
  infile in filevar = readit end = lastfile;
  do while(lastfile = 0);       
    input  @1 RouteID $7. @8 Origin $3. @11 Dest $3. 
           @14 Distance 5. @19 Fare1st 4. 
           @23 FareBusiness 4. @27 FareEcon 4. 
           @31 FareCargo 5.;	         
    output;
  end;
run;

In the following program, Route1.dat, Route2.dat, Route3.dat, Route4.dat, and Route5.dat are also concatenated to create the SAS data set Work.NewRoute. In this example, the names of the raw data files are stored in the external file Rawdatafiles.dat, which is referenced in the first INFILE statement. The name of the FILEVAR= variable, Readit, is the name of the variable read from Rawdatafiles.dat. The value of Readit is the name of the raw data file to be read.

1---+----10---+----20  
route1.dat  
route2.dat  
route3.dat   
route4.dat   
route5.dat

data work.newroute;
   infile 'rawdatafiles.dat';
   input readit $10.;
   infile in filevar=readit end=lastfile;
   do while(lastfile = 0);       
      input  @1 RouteID $7. @8 Origin $3. @11 Dest $3. 
             @14 Distance 5. @19 Fare1st 4. 
             @23 FareBusiness 4. @27 FareEcon 4. 
             @31 FareCargo 5.;	         
      output;
   end;
run;