Mainframe ISPF and JCL Commands

In JCL, parameters are passed to a program via the PARM parameter using single quotes: PARM='value'. The value is then available in the program's linkage section. Double quotes, parentheses around the value, or equal signs inside parentheses are not valid syntax for parameter passing.

The JCL INCLUDE statement is used to copy a predefined set of JCL statements (such as DD statements or entire steps) from a library member directly into a job stream.

Temporary datasets in JCL are created with DSN=&&prefix and are used only for the duration of the job. They are automatically deleted after job completion. Storage datasets are permanent datasets that persist beyond the job, making 'Temporary dataset' the correct answer.

The COND (conditional) parameter in JCL specifies conditions for executing subsequent job steps based on return codes from previous steps. It can be coded on both JOB and EXEC statements. Conditional checking controls job flow, while JCL checking, Job checking, and EXEC checking are not standard JCL terms.

In JCL, the parameter field can contain only an asterisk (*) to indicate a null parameter or to override a previous parameter. The operation field contains the command (like EXEC or DD), the label field identifies the statement, and comments are indicated by // in column 1-2 followed by text.

SYSABEND is a special DD name used in JCL to capture system dump information when a job abnormally terminates (ABEND). It's a reserved DD statement name. JOBABEND, JCLABEND, and STEPABEND are not standard special DD names in JCL.

The PEND statement marks the end of an in-stream procedure in JCL. In-stream procedures start with PROC and must be terminated with PEND. EXEC executes a program or procedure, CNTL is for control statements, and PROC begins a procedure definition.

JCL statements are fixed-length 80-byte records, inherited from IBM punch card standards. Columns 1-2 contain //, columns 3-71 for name/operation/parameters, column 72 for continuation, and columns 73-80 for sequence numbers (optional). 60, 100, and 120 bytes are not standard JCL record lengths.

The REFLIST command in ISPF displays the Referral List, which contains a history of the most recently accessed datasets, allowing you to easily find and reopen them.

In ISPF edit mode, 'COMPARE SESSION' shows changes made since the last SAVE command, comparing current session state to the last saved version. 'COMPARE COMMAND' compares against the original version at first open. The numeric options 3.13 and 3.14 are likely line commands or unrelated options, not the correct compare command.

In ISPF, the RETP (Retrieve Previous) command displays the last 25 commands issued from the command line. This provides a command history that users can recall and reuse. The other options are not valid ISPF commands for this purpose - REFRESH refreshes the screen, and REFLIST/LAST COMMANDS are not standard ISPF command history commands.

In ISPF, when you encounter a 'member in use' message while opening a PDS member, pressing F1 twice displays information about who is currently using that member. The first F1 shows general help, while the second F1 press reveals the lock holder details. This helps identify which user or job has exclusive access to the member.

In ISPF, you can view and edit the contents of the clipboards by using the command CUT DISPLAY or PASTE DISPLAY, which opens a panel showing the active clipboards.

REFLIST is the ISPF command that displays the list of recently accessed datasets. It shows the last 10 datasets that were accessed during the ISPF session.

COMPARE SESSION is the ISPF command that shows all changes made since the last SAVE command. It displays the differences between the current session and the last saved version.

The RETP (Retrieve Panel) command in ISPF displays a pop-up panel showing the last 25 commands issued from the command line, allowing users to select and re-execute them.

In ISPF, when you attempt to edit a member that is already in use, pressing F1 twice (or requesting help twice) displays the detailed system message showing the user ID of the person currently holding the lock.

ISPF does allow viewing and editing the clipboard. The clipboard contents can be displayed and modified using ISPF commands or through the edit utilities.

IDCAMS (Access Method Services) utility requires SYSPRINT for output messages and SYSIN for control commands. These DD statements are mandatory for IDCAMS to function - SYSPRINT receives execution output and SYSIN provides the commands.