November 7, Ted Holt. For the third straight release, IBM has added solid features to the compiler. Since I use CL heavily, I greatly appreciate the effort. This gives you another way to process a file more than once in a CL procedure.
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CL overview and concepts. This version does not run on all. CL comm and information and documentation Control language CL allows system programmers and system administrators to write programs using. The control language topic collection contains information about all control language CL comm and s that.
It also includes many CL comm and s for licensed programs that. Before using CL comm and s, you should be familiar with the CL programming concepts discussed in the. CL comm and s are typically used by programmers, data processing managers, and system administrators. To use comm and s, you should have a general. If you want to combine several CL comm and s together to. In the CL comm and finder, you can search for comm and s by product, by comm and name, by descriptive.
You also can search for new comm and s and changed comm and s. You can. Read about new or significantly changed information for the Control language topic collection. Values that are specified on the CMD statement take precedence over any values. Unicode support was added to the CL comm and s. You can display a list of all new comm and s or all changed comm and s using the CL comm and finder.
In PDF files, you might see revision bars in the left margin of new and changed information. The following links provide the PDF versions of the CL concepts and reference information, as well as. For information about printing comm and information from your system,.
CL overview and concepts KB pages. Communications Utilities for System i comm and s KB pages. You can download a free. The control language topic collection contains information about all control language CL comm and s. It also includes many CL comm and s for licensed. To print the parameter and value descriptions for a CL comm and , follow these instructions. The control language CL is the set of all comm and s with which a user requests system functions. The control language CL , menu options, and system messages control the operation of the system.
Control language CL is the primary interface to the operating system. CL can be used at the same time. A single control language statement is called a comm and. Comm and s can be entered in the following. Comm and s can be entered individually from any comm and line or the Comm and Entry display.
To simplify the use of CL , all the comm and s use a consistent syntax. In addition, the operating system. CL provides a single, flexible interface to many different system functions that can be used by different. A control language CL comm and is a single statement to request a system function.
The system provides a large number of menus that allow users to perform many system functions just by. System messages can report both status information and error conditions. Most data processing systems. Two types of messages are supported:. These messages are placed in a message. Because messages can be used to provide communications between programs, between procedures in a. The following concepts of message h and ling are important to. Because messages are defined.
Messages do not have to be sent to a specific device; one program can be. The message description contains the text of the message and information about replacement variables,. Message descriptions are stored in message files.
Each description must have an identifier that is unique. When a message is sent, the message file and the message identifier tell the system which. When a message is sent to a procedure, a program, or a system user, it is placed on a message queue. The procedure, program, or user sees the message by. Additional message queues can be created to meet any special application requirements.
Messages sent to. CL can be used at the same. The comm and name identifies the function that will be performed by the program that is called when the. Most comm and names consist of a combination of a verb or action followed by a. Abbreviated words, typically one to three letters, make up the comm and name.
This reduces the amount. The result is three comm and s that can operate on a library:. In another example, one of the CL comm and s is the Send Message. The conventions for naming the combination verb and object comm and s are as follows:. Some comm and names consist of the verb only, such as the Move MOV comm and , or an object only,. An alternate name is known as an alias, such as the name CD is an alias for the Change Current.
The name of a specific object that is located in a library can be specified as a simple name or as a. Abbreviations of CL comm and s and keywords:. The first three letters of the comm and name known as the comm and verb represent the action that is.
The remaining letters of the comm and name describe the object that is having the. CL comm and s enable you to request a broad range of functions. You can use IBM -supplied. The majority of all CL comm and s use one of these common comm and verbs.
The following table lists all the abbreviations that are used as comm and verbs. This table lists all abbreviations that are used in CL comm and names, including comm and verb. Each comm and parameter has a keyword name associated with it. The keyword name can be up to Keyword names do not follow the same style as comm and names in that they do not necessarily begin. Where possible, use a single word or abbreviation.
For example, common. Construct a keyword name whenever using more than a single word or abbreviation to describe the. Construct the keyword name by using a combination of st and ard comm and abbreviations and. The two primary goals for keyword names are to be recognizable and to be consistent between.
Use of simple words and st and ard abbreviations helps to. The following table contains a list of abbreviations that are used in CL comm and parameter keyword. The parts of a comm and include a comm and label optional , a comm and name mnemonic , and one or. A comm and name and parameters make up each CL comm and.
The parameters used in CL comm and s are keyword parameters. The keyword, typically abbreviated the. However, when comm and s are entered,. Comm and s have the following general syntax. The brackets indicate that the item within them is. Comm and labels identify particular comm and s for branching purposes in a CL program. Labels can also. They can identify statements. The label is typed just before the comm and name. The st and ard rules for specifying simple names. The label is immediately followed by a colon.
Blanks are allowed, though not required,. The label can contain as many as 10 characters, in addition to. Comm and labels are not required, but a label can be placed on any comm and.
System i: Programming CL overview and concepts - IBM notice
In some realities, this is comparable to software that is the "glue" connecting higher level language programs like RPG ; data base files and their over-rides; screen and print "files" and their overrides; and other objects with Menus Thus, a CLP program might also be thought of as a command script except that it is compiled and creates an object like any other program. Some of them are used to define the environment for a CLP program or control its flow. In later releases, IBM also added the following CL-only commands or "statements" for additional definition and control of a CL program. Initially, CLP offered the following built-in functions. As of V5R4, CL allows the use of pointers. There were some problems with uninitialised pointers, and PTFs were issued.