CL concepts

This describes concepts useful when using control language (CL) commands.

• System operation control
  This describes how you can control the operation of the system using control language (CL), menu options, and system messages.
• Commands
  This defines a command and provides information about how commands are named, the parts of a command, and command documentation. A control language (CL) command is a single control language statement.
• CL programs and procedures
  CL programs and procedures are created from source statements consisting entirely of control language commands. The commands are compiled into either an OPM program or an ILE module that can be bound into programs made up of modules written in CL or other languages.
• Parameters
  A parameter is a value that is passed to a command or program to provide user input or control the actions of the command or program.
• Control language elements
  This covers elements of CL such as character sets and values, expressions, built-in functions, and naming within commands.
• Objects
  An i5/OS™ object is a named unit that exists (occupies space) in storage, and on which operations are performed by the operating system. i5/OS™ objects provide the means through which all data processing information is stored and processed by i5/OS™.
• Database and device files used by CL commands
  This provides a cross-reference between the commands and the IBM-supplied files used by the commands.