Message from discussion
TSO EDIT command
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From: r...@ibm-main.lst (Robert Wright)
Newsgroups: bit.listserv.ibm-main
Subject: Re: TSO EDIT command
Date: 18 Oct 2005 12:53:56 -0700
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References: <43553A84.9020303@trainersfriend.com>
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Steve Comstock wrote on 10/18/2005 02:10:12 PM:
> In our TSO CLIST course, we include a brief discussion
> of the [rather arcane] TSO EDIT command; it is clear
> I can include an edit command followed by various
> edit subcommands in a CLIST.
>
> But I have trouble accomplishing the same work in
> a REXX exec. I've tried emulating the CLIST approach
> (edit command followed by lines with edit subcommands)
> and PUSHing the edit subcommands on the stack before
> issuing the edit command. To no avail.
>
> Looks like I'll have to call a CLIST to get that
> work done. Anyone able to shed any light on this one?
EDIT is an example of what the original TSO design called a modal command,
one that chats with you repeatedly until you say END. (IPCS is another.)
CLIST caters to such commands by yielding control each time that a GETLINE,
PUTLINE, PUTGET, or STACK operation completes, allowing the TMP to pass
control to a program and the program, in turn, to solicit input from the
same CLIST. REXX assumes a different control flow model. It sets up shop
and passes what are generally-expected to be requests for complete
transactions to commands. REXX can pass control to a modal command, but it
just waits for the command to complete before progressing past invoking the
modal command.
Bob Wright - z/OS MVS Service Aids
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