Shmuel Metz , Seymour J. wrote:
In <[EMAIL PROTECTED]>, on 07/31/2006
at 09:40 AM, Anne & Lynn Wheeler <[EMAIL PROTECTED]> said:
cms had "update" command from mid-60s ... which applied an update
control file to source,
I'm not sure when it came along, but by VM/SE there was a somewhat
more sophisticated UPDATE facility[1] with aux files, control files
and update files. I'd love to see a similar facility integrated with
ISPF.
[1] Not only could the XEDIT editor process them, but it could
generate update files to reproduce the effects of an edit
session. That's one of the CMS facilities I miss the most.
CDC 6000 batch source maintenance tools (UPDATE?) even in the late
1960's had much more elegance than IBM counterparts. User supplied
source statements for the Assembler were constrained to 80-byte card
images (72 columns + sequence), but the assembler actually supported 90
byte input lines, which allowed library maintenance tools to introduce a
much longer sequence identification which included a modification name
(analogous to a SYSMOD ID) and a sequence number within that
modification. I believe the sequence numbers were generated
automatically as part of the initial storing into the source library or
updating of the source member, and then could be used afterwards to
uniquely refer to a specific statement for future updates. It was
always clear which named modification introduced a statement without
having to resort to manually inserted and possibly incorrect comments.
Statements could be replaced or deleted, but the original statement was
still retained in a disabled state and could be resurrected at a later
time by another modification, or at any time you could choose to undo
modifications and revert to an early source version. I can still
remember my disappointment on discovering the lack of comparable
built-in facilities on MVS in the mid 1970's.
--
Joel C. Ewing, Fort Smith, AR [EMAIL PROTECTED]
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