Ahh, missed that part. Thanks for the clarification. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Bass, Walter W Sent: Wednesday, July 18, 2012 1:44 PM To: [email protected] Subject: Re: Unsetting a JCL symbol.
Line 2 is the line I added to correct the prior example that failed. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Pommier, Rex R. Sent: Wednesday, July 18, 2012 2:00 PM To: [email protected] Subject: Re: Unsetting a JCL symbol. But doesn't line 2 set MYSYM to 'INITVAL'? -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Bass, Walter W Sent: Wednesday, July 18, 2012 10:33 AM To: [email protected] Subject: Re: Unsetting a JCL symbol. Paul, Note in your example that lines 3 and 4 are NOT followed by message IEFC653I as they would be if any symbol substitution took place. The reason your example does not work is because when lines 3 and 4 are evaluated, &MYSYM has not yet been assigned any value, therefore the JCL processor does not yet consider it to be a symbol. On lines 3 and 4 it is treated as a literal and &SAVESYM is set to the literal value "&MYSYM" rather than the value of the symbol &MYSYM. If &MYSYM is assigned a value prior to line 3, it works as expected. 2 // SET MYSYM='INITVAL' 3 //BEFORE EXEC PGM=IEFBR14,PARM='&MYSYM.X' //* //***** SAVE CURRENT VALUE OF MYSYM IEFC653I SUBSTITUTION JCL - PGM=IEFBR14,PARM='INITVALX' 4 // SET SAVESYM=&MYSYM //***** SET MYSYM TO A NEW VALUE IEFC653I SUBSTITUTION JCL - SAVESYM=INITVAL 5 // SET MYSYM='NEWVAL' 6 //DURING EXEC PGM=IEFBR14,PARM='&MYSYM.X' //* //***** RESTORE MYSYM IEFC653I SUBSTITUTION JCL - PGM=IEFBR14,PARM='NEWVALX' 7 // SET MYSYM=&SAVESYM IEFC653I SUBSTITUTION JCL - MYSYM=INITVAL 8 //AFTER EXEC PGM=IEFBR14,PARM='&MYSYM.X' IEFC653I SUBSTITUTION JCL - PGM=IEFBR14,PARM='INITVALX' Thanks, Bill -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Paul Gilmartin Sent: Tuesday, July 17, 2012 6:06 PM To: [email protected] Subject: Re: Unsetting a JCL symbol. On Tue, 17 Jul 2012 16:43:32 -0500, Bass, Walter W wrote: >Try this ... > >//***** SAVE CURRENT VALUE OF MYSYM >// SET SAVESYM=&MYSYM >//***** SET MYSYM TO A NEW VALUE >// SET MYSYM='NEWVAL' > >... >//***** RESTORE MYSYM >// SET MYSYM=&SAVESYM > >Probably not the answer you wanted, but it works. > Actually, it doesn't work: 3 //BEFORE EXEC PGM=IEFBR14,PARM='&MYSYM.X' //* //***** SAVE CURRENT VALUE OF MYSYM 4 // SET SAVESYM=&MYSYM //***** SET MYSYM TO A NEW VALUE 5 // SET MYSYM='NEWVAL' 6 //DURING EXEC PGM=IEFBR14,PARM='&MYSYM.X' //* //***** RESTORE MYSYM IEFC653I SUBSTITUTION JCL - PGM=IEFBR14,PARM='NEWVALX' 7 // SET MYSYM=&SAVESYM IEFC653I SUBSTITUTION JCL - MYSYM=&MYSYM 8 //AFTER EXEC PGM=IEFBR14,PARM='&MYSYM.X' IEFC653I SUBSTITUTION JCL - PGM=IEFBR14,PARM='&MYSYMX' 9 // ... notice the difference between lines 3 and 8. >Another possibility is to take advantage of the fact that symbols that >are SET within a PROC automatically revert to their former value after >the PROC terminates. > That one I believe. Steve suggested it too. But in open code, there seems to be no solution. Symbols are initially in a Garden of Eden state (which John G. dislikes). Once they leave they can never return. -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN This e-mail, including attachments, may include confidential and/or proprietary information, and may be used only by the person or entity to which it is addressed. If the reader of this e-mail is not the intended recipient or his or her authorized agent, the reader is hereby notified that any dissemination, distribution or copying of this e-mail is prohibited. 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