iSeries

Lecture 4

‘*’ (Asterix)

• When used before an ‘AS/400’ word, indicates that the word is a special value.eg. CRTLIB LIB(MYLIB) TYPE(*TEST) TEXT(‘Test Library)

• When used at the end of a word, indicates a generic combination of alphanumerics (wildcards).eg. WRKLIB TST*

How does the AS/400 find Objects?

iSeries finds Objects

• Qualified NamesLibrary/ObjectBTO230LIB/PGM1

• Using Library Lists!How are Library Lists sequenced?

When would you use a Qualified Name to find an object?

• The object exists in two or more libraries on your library list.

• The object does not exist on your library list.

• You do not have authority to the object, but want to check if it exists.

iSeries finds Objects

Note: Library Descriptions, Device Descriptions and User Profiles are stored in QSYS. All other Object Types can be stored anywhere.

Library List

• Determine where a Job finds Objects

Library Lists

• Each job has an attached Library List• Different Types of Libraries:

– System: IBM Supplied– Product: Added automatically when an IBM

product is used– Current: Defined by an individual user ID

User ID’s default Library

– User: Non-IBM Supplied LibrariesCreated by Business to organize

programs, files, etc.

CL Syntax

Command-name

(space) parameter

CL

• Control Language (CL) is a set of commands that you use to control operations and to request system-related functions on the IBM AS/400 computer.

Naming of Commands

• Based on English!

• Combination of Verb and Noun

CRTLIB

LibraryCreate

CL Commands

• Some typical nouns

CL Noun English DescriptionLIB Library Object that holds Objects

LIBL Library List List of Libraries for a Job

OUTQ Output Queue Object that stores Spool Files

JOBQ Job Queue Object that stores Batch Jobs to be processed

FD File Desc Description of file

F File Object that stores data

USRPRF User Profile Object that lists attributes about

a Sign On Id

CL

• CL serves purposes comparable to Job Control Language (JCL) on mainframe computers.

• CL provides much more functionality than JCL.• • CL is similar to the PC-DOS commands you may use on a PC. DOS

operations like copying files, redirecting output, and making directories have direct CL counterparts.

• CL is very rich in function but it is not considered to be a high-level language (HLL). You would not, for example, write a payroll application using CL.

CL

• CL commands may be entered into the system interactively on an AS/400 command line or included in a CL program

• group CL commands together, they may be compiled into a program object or submitted for interpretation during a batch process

CL

1. Using what you know about abbreviated verbs and subjects, identify the function of the following AS/400 CL commands:

a. ADDLIBLE

b. CHGPGM

c. CLRPFM

d. RMVMSGD

e. DSPOBJAUT

CL

1. What is a source physical file and what does it contain?

2. What steps would you follow to create a CL program?

3. When will the CL compiler not produce a CL program object?

CL programming

1. Here are the four steps typically involved with creating a CL program:

1. Create a source physical file in your library to hold the source code for your CL programs QCLSRC

2. For each specific program, add a member to the source physical file. F6

3. Type all the needed CL commands into the source member SEU

4. Compile the CL program, creating a program object option 14