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Intro Mainframe Exercise

In: Computers and Technology

Submitted By jimmym
Words 2097
Pages 9

Logon to your account and open ISPF. The default setting in ISPF is for the command line to be at the bottom of the screen. Most systems programmers, though, prefer to have the command line at the top of the screen. Let's quickly change this so you'll look like an old pro. On the command line, type 0 and press Enter.

This takes you to the ISPF Settings menu. Go to the field beside Command line at bottom. Delete the "/" using the delete key (the backspace key will bring you back a space but will not delete characters). Press Enter. The command line jumps to the top of the screen.


To get back to the ISPF Primary Option Menu, press F3. F3 almost always takes you one screen back If you accidentally hit F3 too many times, you'll be taken all the way back to the TSO READY prompt - to get back to the ISPF Primary Option Menu from here, type ISPF and press Enter.

Log off of z/OS, by pressing F3 until you arrive at the TSO READY prompt. Type LOGOFF and press Enter:

IF you have done more extensive work during your session, you will see this Specify Disposition of Log Data Set screen when you attempt to F3 past the ISPF Primary Option Menu:

Whenever you encounter this screen, select option 2: "Delete data set without printing," and press Enter. You will then be taken to the TSO READY prompt, and the system informs you that a log that you don't need has been deleted. Type LOGOFF and press Enter to end your session. Should you not follow this logoff procedure, you will get a LOGON REJECTED error when you try to log back in:

If this happens to you, enter LOGON on this screen, then supply your user ID at the next prompt.

Once you get to this screen:

enter your password (but don't press Enter yet). Now Tab down until the cursor is beside -Reconnect, and put an S there. press Enter.

When you get the ‘LOGON RECONNECT SUCCESSFUL’ prompt:, press enter

Use ISPF facilities to locate data sets
If you are not already there, log back in to ISPF.

select option 3 (Utilities), and press Enter. On the next screen:

select option 4 (Dslist - short for data set list) and press Enter. Several data sets have already been created for your z/OS user ID. Let's go take a look at them. On the line Dsname Level, type your user ID: - press enter

You'll be presented with a list of all of the system-generated data sets that have been created for you: NOTE: A partitioned data set (PDS) is the mainframe equivalent of a folder. A partitioned data set (PDS) set contains members, which you are probably used to calling files. Let's have a look at a member that contains a copy of a program that you'll be running a little later. Tab down until your cursor is beside the ‘YOURUSERID.JCL’ line, then type a B (for browse): and press Enter.

You'll see a list of all of the members in the data set. You then browse members by entering a B on the field next to them. Try this on the member named COUNT (NOTE: if you were going to Edit a member, you'd enter it using E instead — but we're not doing that just yet):

The COUNT member contains a copy of some code that you'll be running shortly. You don't need to do anything here now, but you've just learned how to navigate into data sets and members Now press F3 until you're back at the ISPF Primary Option menu. Let's create a new member for you to check out.

Populate your data set with a member
Right now, most of your data sets (folders) contain data that you'll need later in the contest. But you also need to know how to create your own data. A member (file) can be anything you'd like it to be - flat text, executables, program output - just like the files on your home computer. Let's create a simple flat text member. F3 all the way back to the ISPF Primary Option Menu. Select option 2 (Edit). Let's name the new member after the person who's going to create it - you. Data sets are named with 1-8 character identifiers separated by periods, like this: USERID.COMPETE.PARTONE. When you're creating or editing new members, the

system automatically assumes that you want the first identifier (called the high level qualifier or HLQ) to be your user ID, unless you put single quotes around the entire data set name, which you will rarely do.. Tab down until your cursor is on the Name field. The data set we're going to populate is your USERID.COMPETE.PARTONE data set. Enter COMPETE.PARTONE as the data set name, then type your new member name in parentheses directly following the data set name. Your new member name must be the first eight letters [or less] of your last name. [NOTE: In our example, we use the name Hal for demonstration purposes].

Press Enter to continue. The system creates a new member named after you in the data set USERID.COMPETE.PARTONE and automatically opens it in an editor session.

You are now in the ISPF editor, looking at a blank member:

Tab your cursor to the first line of blank space (two lines under the first "-" in “Warning”)

Now type in three lines worth of whatever you'd like to say, using the tab key to move to the second line when you're done with the first, and so on. When you are finished entering the text, press Enter. (If at any point you mess up and would like a clean slate, enter CAN (short for cancel) on the command line. Your work will not be saved, and you will return to the previous screen. Press Enter on that screen, and you will have a fresh data set member again. You can also enter HELP at any time on the command line for more information about the ISPF editor.) Your screen should now have three lines of text:

The ISPF editor has made the member exactly three lines long and chopped off the excess blank lines. To save your work, type SAVE on the command line and press Enter.

Use the ISPF editor to manipulate text
Now let's practice some simple ISPF editor commands - the basic tools for editing and modifying members. To insert more blank lines, you will use the I command (for insert). Line commands go in the numbered field beside the lines of text, right on top of the existing line numbers. Let's insert two lines by putting the I2 command on the third line (go ahead and type right over the line numbers that are there):

Now press Enter. Two blank lines have been created:

Let's now copy your brilliant text fifty times over. To do this, put a CC on the first line you want to copy, and a CC on the last line you want to copy (the first and third lines of your text, respectively). To tell the editor to paste the copied section fifty times, go to the last line, and put an A50 in the last line's command field - the A

stands for paste After this line. before a given line.]

[NOTE: B50 would mean paste

Your screen should now have the two CC commands and the A50 command correctly placed:

Now press Enter. Your 3 lines have now repeated fifty times, off the bottom of the screen:

Notice you still have one blank line. Paging up and down using F7 and F8, respectively, will automatically delete ALL blank lines. [OR you can also delete a blank line by putting a D to the left of it and pressing enter, if you prefer. Delete the line now by either paging with F7/F8 or by using a D.

The line should now be gone:

[FYI: You can use DD the same way you used CC to delete multiple lines of text, but we will not do that at this point]

Now let's repeat the command.

first line of text 10 times. To do this, use the R (repeat)

Type R10 on the first line:

B Now press Enter, and your first line repeats ten times, with new line numbers to match: [Note: your line numbers are probably different than the example]

On the command line, enter the command BOTTOM. This takes you to the bottom of the member. Tab down and use the I command to insert one more line after the last line of the member. On the new line, enter BCIS 3620 - SYSTEM Z TOPICS Press Enter after you've added the new line:

On the blank line at the bottom, type your first and last name, followed by UNT, and press Enter:

You've now learned how to log onto a mainframe, to navigate the ISPF panels and to create and edit your own data set members. Let's save your work and move on. F3 out of your data set member - it will save automatically (if you ever want to quit without saving, remember that CAN for cancel will do the trick). Now let's run an executable program against the member you just created.

Run an executable against your new data set member
From the ISPF Primary Option screen, select option 6: Command.

This screen lets you enter TSO commands from ISPF. We need to execute a REXX program that is stored in the member ZOS.CONTEST.REXX(COUNT) against the member you created in the steps above using the first eight letters of your first name

To execute the REXX program, type on the command line:



'your_last name'

Remember, this example uses ‘HAL’

Press enter

The program will begin running, giving you the following message:

Remember, the *** means that the system is waiting for your input. Press Enter to continue executing the program.

Press Enter again to clear the system output. The program has now executed. Let's go see what it did! Instead of using F3 to back out to the ISPF Primary Option Menu, let's use a shortcut. On the command line, enter =3.4 :

This is the same as choosing option 3 from the Primary Option Menu, then choosing 4 on the next screen. You should recognize the screen you are now looking at as the Data Set List Utility screen:

Make sure your user ID is specified on the Dsname Level field, and press Enter. On the next screen, put an E for edit beside the data set :


Press Enter. There is a new member in your data set now, named after your user ID. Put an E beside it and press Enter to have a look.

When the REXX program ran, it counted each occurrence of the lines of your MEMBER and generated output back to your PDS:

IMPORTANT: Type SAVE on the command line and press Enter. Doing this will timestamp the member so IBM can tell when you completed this step. You must do this, so that your entry may be judged: [NOTE: BCIS 3620 PROJECTS WILL NOT BE SUBMITTED TO IBM]

After you save the member, you can verify that it was saved correctly by the white message in the upper right-hand corner, Member YOURUSERID saved:

F3 back one screen. The prompt informs you that the member was edited:

You've now completed all the steps for this exercise except for sending your work to GUYNES/ IBM. Let's do that now!

Transmit your data set member to WINDSOR/IBM
On the command line, type =6 , which is a shortcut for going back to the ISPF Primary Option Menu and selecting option 6: Command.

Now you need to submit all your hard work to WINDSOR/IBM, which, for this contest, is using the user UNTA002. To transmit your REXX output member to this ID, type the following command on the command line :
XMIT N1.UNTA002 DA(COMPETE.PARTONE(YOURUSERID)) The system will generate a message to let you know that the member has been submitted for processing: Press Enter to continue. At the next set of messages, verify that "0 WAS THE HIGHEST SEVERITY CODE": LEAVE EVERYTHING ON THE SYSZ, AS I WILL GRADE THE OUTPUT FROM WHAT IS IN THE ‘PARTONE FOLDER’ ON THE SYSZ


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