How To Read a Dataset In REXX

File handling is REXX is one of the most easiest thing to do. The file reading in rexx is done in a line by line reading format. For example this the below happens when a dataset in read in rexx

• Each line of the Dataset is stored in each subscript in a array . For example array.1 will have the first line of the dataset and array.2 will have the second one and so on.
• The total number of lines read will be available in array.0 variable which will be used to used to loop through the lines.
• Below is the example how to read a dataset 'MY.PS.READ' into array.

           

                      "ALLOC FI(LNAME) DA('MY.PS.READ') SHR"
                      "EXECIO * DISKR LNAME(STEM ARRAY. FINIS"
                      "FREE FI(LNAME)"

      • Where LNAME is the logical name of the dataset 'MY.PS.READ'.

      •  Finally it is a good practice to free the file you are reading

      •  Now if you want to display all the contents within the array can use this code.

                            DO I=1 TO ARRAY.0

                                  SAY ARRAY.I

                                         END



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