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The operation of SORT is directed by control statements, which are largely compatible among various IBM and third-party sort programs. The SORT or MERGE statement defines the sort keys— the fields on which the data is to be sorted or merged. This statement identifies the position, length, and data type of each key.
Job Control Language (JCL) is a scripting language used on IBM mainframe operating systems to instruct the system on how to run a batch job or start a subsystem. [1] The purpose of JCL is to say which programs to run, using which files or devices [2] for input or output, and at times to also indicate under what conditions to skip a step.
A sort is a special case: all the input records must be read before the first output record can be written. Hence there can be no overlap between the input and output phases of a sort. But the input phase can be overlapped with the previous job's output phase. Similarly, the output phase of sort can be overlapped with a downstream job that ...
IBM Data Facility Sort (DFSORT) Release 10.0; In addition to replacing part of the device support in the base MVS/SP, DFP replaces the Linkage Editor and several utility programs and service aids. DFP is no longer available as a separate product, but has become part of Data Facility Storage Management Subsystem, under the name DFSMSdfp.
For example, TSO on z/OS systems uses CLIST or Rexx as command languages along with JCL for batch work. On other systems these may be the same. The Non-IBM JCL of what at one time was known as the BUNCH (Burroughs, Univac/Unisys, NCR, Control Data, Honeywell), except for Unisys, are part of the BANG [3] [4] that has been quieted.
For example, there could be a small partition, two medium partitions, and a large partition. ... Job Control Language (JCL), ... Data Facility Sort, 5740-SM1;
The JCL it used for submitting jobs was designed to be easy for the low-end machines to process, and as a result, programmers did not find it easy to read or write. There was no spooling sub-system to improve the efficiency of punched card and printer use. In the late 1960s, an independent software company started selling a spooler called GRASP.
Innovative Routines International (IRI), Inc. is an American software company first known for bringing mainframe sort merge functionality into open systems. [1] IRI was the first vendor to develop a commercial replacement for the Unix sort command, and combine data transformation and reporting in Unix batch processing environments. [2]