IBM SC34-5764-01 Manuale Utente Pagina 152
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REXX General Concepts
130
CICS TS for VSE/ESA: REXX Guide
- R EXX Guide 1
- Contents 5
- Contents v 7
- Contents vii 9
- Contents ix 11
- Contents xi 13
- Contents xiii 15
- Contents xv 17
- Contents xvii 19
- What this book is about 21
- Who this book is for 21
- Prerequisites 21
- Part 1. User's Guide 23
- Chapter 1. Introduction 25
- Components of REXX 26
- What is a REXX Program? 27
- Syntax of REXX Instructions 28
- Ending an instruction 29
- Continuing an instruction 29
- Types of REXX Clauses 31
- Null Clause 32
- Typing in a Program 33
- Running a Program 33
- Interpreting Error Messages 34
- Characters within a program 35
- Characters Input to a program 36
- Specifying Too Few Values 37
- Specifying Too Many Values 37
- Passing Arguments 39
- Program Variables 41
- Using Variables 41
- Variable Names 41
- Variable Values 42
- Using Expressions 43
- Order of Evaluation 44
- Comparison Operators 45
- Using Comparison Expressions 46
- Logical (Boolean) Operators 47
- Using Logical Expressions 48
- Concatenation Operators 49
- Priority of Operators 50
- Tracing Operations 51
- Tracing Results 52
- IF...THEN...ELSE Instructions 55
- Control Flow within a Program 56
- Tr ueFalse 58
- Using Looping Instructions 61
- Repetitive Loops 61
- Infinite Loops 62
- DO FOREVER Loops 62
- LEAVE Instruction 63
- ITERATE Instruction 63
- Conditional Loops 64
- DO WHILE 65
- DO UNTIL 66
- Combining Types of Loops 68
- Nested DO Loops 68
- Exercises - Combining Loops 69
- Using Interrupt Instructions 70
- EXIT Instruction 70
- CALL and RETURN Instructions 71
- SIGNAL Instruction 72
- Chapter 5. Using Functions 73
- Built-In Functions 74
- Arithmetic Functions 75
- Comparison Functions 75
- Conversion Functions 75
- Formatting Functions 76
- String Manipulating Functions 76
- Miscellaneous Functions 77
- Using Functions 78
- Passing Information 82
- ARG arg1, arg2, arg3, 87
- Exercise - Writing a Function 90
- Chapter 7. Manipulating Data 93
- Using Stems 94
- Parsing Data 95
- Parsing Instructions 95
- ARG Instruction 96
- PARSE VAR Instruction 96
- More about Parsing into Words 97
- Parsing with Patterns 97
- Variable 98
- Manipulating Data 100
- Types of Commands 103
- Using Variables in Commands 103
- Using Commands from a Program 104
- Debugging Programs 107
- Starting Interactive Debug 108
- Ending Interactive Debug 109
- Consider the Data 111
- Test Yourself 111
- Happy Hour 112
- Designing a Program 114
- Methods for Designing Loops 115
- The Conclusion 115
- What Do We Have So Far? 116
- Reconsider the Data 117
- Correcting Your Program 117
- Modifying Your Program 117
- Tracing Your Program 117
- Coding Style 118
- Part 2. Reference 123
- Chapter 11. Introduction 125
- Introduction 126
- SQL Interface 128
- Structure and General Syntax 131
- Characters 132
- Comments 132
- REXX General Concepts 133
- Implied Semicolons 136
- Continuations 137
- Expressions and Operators 137
- Expressions 137
- Operators 137
- String Concatenation 138
- Arithmetic 138
- Comparison 139
- Logical (Boolean) 140
- Assignments and Symbols 143
- Constant Symbols 143
- Simple Symbols 144
- Compound Symbols 144
- Environment 146
- Commands 146
- REXX Exec Invocation 147
- Where Execs Execute 148
- Locating and Loading Execs 148
- Editing Execs 148
- DBCS Support 151
- Miscellaneous Features 151
- ADDRESS VALUE expression 153
- Simple DO Group 160
- Repetitive DO Loops 161
- INTERPRET 167
- OPTIONS expression ; 173
- Parse Numeric Var1 175
- PARSE VAR string word1 string 175
- PROCEDURE 177
- RETURN 183
- Example: 184
- Prefix Options 189
- Numeric Options 190
- A Typical Example 190
- Format of TRACE Output 190
- Chapter 14. Functions 193
- Search Order 194
- Errors During Execution 195
- Built-in Functions 196
- ABBREV (Abbreviation) 197
- ABS (Absolute Value) 197
- ARG (Argument) 197
- BITAND (Bit by Bit AND) 198
- BITOR (Bit by Bit OR) 199
- B2X (Binary to Hexadecimal) 199
- CENTER/CENTRE 200
- CONDITION 200
- C2D (Character to Decimal) 201
- DATATYPE 202
- Functions 203
- DELSTR (Delete String) 205
- DELWORD (Delete Word) 205
- D2C (Decimal to Character) 205
- D2X (Decimal to Hexadecimal) 206
- ERRORTEXT 206
- EXTERNALS 207
- LASTPOS (Last Position) 210
- LINESIZE 210
- MAX (Maximum) 210
- MIN (Minimum) 211
- POS (Position) 211
- SOURCELINE 213
- SUBSTR (Substring) 214
- TRANSLATE 217
- TRUNC (Truncate) 217
- WORDINDEX 220
- WORDLENGTH 220
- WORDPOS (Word Position) 220
- XRANGE (Hexadecimal Range) 220
- X2B (Hexadecimal to Binary) 221
- X2D (Hexadecimal to Decimal) 221
- Chapter 15. Parsing 225
- The Period as a Placeholder 226
- Chapter 15. Parsing 205 227
- Chapter 15. Parsing 207 229
- Using UPPER 231
- Parsing Instructions Summary 232
- Parsing Instructions Examples 232
- Advanced Topics in Parsing 233
- Parsing Multiple Strings 233
- Parsing with DBCS Characters 235
- Details of Steps in Parsing 235
- Chapter 15. Parsing 215 237
- Definition 240
- Precision 240
- Arithmetic Operators 240
- Addition and Subtraction 241
- Multiplication 241
- Division 242
- Basic Operator Examples 242
- Integer Division 243
- Remainder 243
- Additional Operator Examples 243
- Numeric Comparisons 244
- Exponential Notation 244
- Numbers and Arithmetic 245
- Numeric Information 246
- Whole Numbers 246
- Numbers Used Directly by REXX 246
- Condition Information 250
- Descriptive Strings 250
- Special Variables 250
- The Special Variable RC 250
- The Special Variable SIGL 250
- Invocation 253
- Screen Format 254
- Prefix Commands 254
- Individual Line Commands 254
- Consecutive Block Commands 255
- Destination Commands 255
- Command Line Commands 256
- BACKWARD 257
- Text Editor 258
- Return Codes 260
- Operands 260
- RESERVED 273
- POOL1:\USERS\USER1\TEST.EXEC 279
- Current Directory and Path 280
- Security 281
- RFS commands 281
- File System 282
- File List Utility 286
- FLST Commands 287
- FLST Return Codes 294
- Directories and Lists 295
- RLS commands 297
- List System 298
- Background 303
- Highlights 303
- Command Definition 304
- CICPARMS Control Block 305
- Non-REXX Language Interfaces 306
- Programming Considerations 307
- Embedding SQL Statements 307
- DB2 Interface 308
- Receiving the Results 309
- Example Using SQL Statements 310
- Overview 313
- REXX/CICS Client Exec Example 314
- REXX/CICS Server Exec Example 315
- Facility 317
- Example of Panel Definition 317
- Defining Panels 318
- Panel Facility 319
- PANEL RUNTIME 324
- PANEL Variables 327
- System Error Reason Codes 329
- State Codes and Input Codes 330
- State codes 331
- Input codes 331
- Location Codes 332
- Examples of Sample Panels 332
- Example 1 332
- Example 2 333
- Example 3 333
- Example 4 334
- Example 5 334
- AUTHUSER 342
- Examples 343
- CONVTMAP 348
- DEFTRNID 360
- EXECDROP 364
- EXECLOAD 368
- FILEPOOL 372
- LISTCLIB 379
- LISTELIB 380
- LISTPOOL 381
- LISTTRNID 382
- SCRNINFO 390
- WAITREAD 397
- Part 3. Appendixes 399
- Error Numbers and Messages 402
- Appendix B. Return Codes 409
- LISTCLIB and LISTELIB 413
- General Description 417
- Symbols and Strings 418
- Validation 419
- Instruction Examples 419
- PUSH and QUEUE 420
- SAY and TRACE 420
- DBCS Function Handling 421
- Built-in Function Examples 422
- DBCS Processing Functions 426
- Counting Option 426
- Function Descriptions 426
- DBADJUST 426
- DBBRACKET 426
- DBCENTER 427
- DBCJUSTIFY 427
- DBRRIGHT 428
- DBTODBCS 429
- DBTOSBCS 429
- DBUNBRACKET 429
- DBVALIDATE 430
- Reserved Keywords 431
- Keywords and Variables 432
- Appendix E. Debug Aids 433
- Debug Aids 434
- Business Solutions 435
- Business Value Discussion 436
- Product Positioning 437
- System Profile Exec 439
- Defining Authorized Users 439
- Parameters 440
- Function IDs 441
- Appendix H. Security 443
- BMS Example 450
- Create the RFS Filepools 453
- Install Resource Definitions 453
- Update LSRPOOL Definitions 453
- Rename supplied Procedures 453
- Update CICSTART.PROC 454
- Format the RFS Filepools 455
- Create the Help Files 455
- Verify the Installation 456
- PI Configuration 457
- Bibliography 459
- VSE/ESA Version 2 Release 5 460
- Bibliography 439 461
- C for VSE/ESA (C/VSE) 462
- COBOL for VSE/ESA (COBOL/VSE) 462
- DB2 Server for VSE 462
- DL/I VSE 463
- PL/I for VSE/ESA (PL/I VSE) 463
- Trademarks 467
- Special characters 469
- Index 449 471
- Index 451 473
- Index 453 475
- Sending your comments to IBM 477
- SC34-5764-01 480
- REXX Guide 481
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