iSeries

1. iSeries Lecture 4

2. ‘*’ (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*

3. How does the AS/400 find Objects?

4. iSeries finds Objects • Qualified Names Library/Object BTO230LIB/PGM1 • Using Library Lists! How are Library Lists sequenced?

5. 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.

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

7. Library List • Determine where a Job finds Objects

8. 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 Libraries Created by Business to organize programs, files, etc.

9. CL Syntax Command-name (space) parameter

10. 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.

11. Naming of Commands • Based on English! • Combination of Verb and Noun CRTLIB Library Create

12. CL Commands • Some typical nouns CL Noun English Description LIB 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

13. 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.

14. 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

15. CL • Using what you know about abbreviated verbs and subjects, identify the function of the following AS/400 CL commands: • ADDLIBLE • CHGPGM • CLRPFM • RMVMSGD • DSPOBJAUT

16. CL • What is a source physical file and what does it contain? • What steps would you follow to create a CL program? • When will the CL compiler not produce a CL program object?

17. CL programming • Here are the four steps typically involved with creating a CL program: • Create a source physical file in your library to hold the source code for your CL programs  QCLSRC • For each specific program, add a member to the source physical file.  F6 • Type all the needed CL commands into the source member  SEU • Compile the CL program, creating a program object  option 14