TOPS-10 SORT/MERGE

This document serves as a user's guide for the TOPS-10 SORT/MERGE utility program, aimed at programmers and users with experience in computer systems, data representation, and file formats. It provides comprehensive procedures for sorting and merging data files.

Key aspects covered include:

• Getting Started: Practical guidance on sorting basic ASCII text files, covering multifield, line-sequenced, tab-containing, variable-length, multiline, and nontext files, along with instructions on determining record and key lengths.
• Operational Procedures: Detailed explanations of SORT/MERGE command formats (SORT, MERGE, RUN, EXIT, HELP), merging multiple pre-sorted files, using command files, and integrating SORT/MERGE with COBOL and FORTRAN programs, including specific restrictions for FORTRAN calls.
• Switches and Parameters: A thorough breakdown of all SORT/MERGE and relevant SCAN switches, categorized by their function (e.g., Required, Key Data Type, Recording Mode, File, Control, Tape) and scope (Global, Local, Position Dependent), with particular emphasis on the mandatory /RECORD and /KEY switches.
• File Formats and Recording Modes: In-depth descriptions of the four recording modes (ASCII, SIXBIT, EBCDIC, and Binary) and various file formats supported by the utility, complete with illustrative diagrams and code examples (COBOL, FORTRAN) to aid in correct file format specification.
• Error Handling and Performance: Information on interpreting error messages and strategies for optimizing SORT/MERGE performance by adjusting parameters like tree size and memory allocation to minimize merge passes.

The guide aims to enable users to effectively sort various file types by understanding the utility's features, commands, file format requirements, and performance considerations.