Paul Gilmartin wrote:

>> Be very careful doing that!  When I was very young I tried something similar 
>> without understanding that the following GO step contained:
>>      //STEPLIB DD DISP=(OLD,DELETE),DSN=*.LKED.SYSLMOD
>> Oops!

A common trap. RACF can help you to protect your dataset with access = UPDATE. 
This is why production loadlibs should not start with your userid.

One of my users, an ancient and somewhat crazy lady has a bad habit to delete 
her datasets and then ringing up the director (instead just calling our direct 
boss) saying WE deleted her things. When the director's contract was ending, 
he/she just call the new director and warn him/her about that troublesome user. 
Eventually we have a daily batch job which run backups incrementally. ;-)

Steve Comstock wrote:
>Yeah, I did something similar once. State of New Mexico was down for two days.

Two days! Ouch. You really make those New Mexicans very OLD!! ;-)

>But the point is that the OP really needs to beef up his understanding of JCL 
>as well as his knowledge of COBOL if he is teaching for the z/OS environment.

Agreed. 

Groete / Greetings
Elardus Engelbrecht

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