CMS, DELETE, GENERATION
*Conan The Librarian (sorry for the slow response - running on an old VAX)
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VMS Help CMS, DELETE, GENERATION *Conan The Librarian (sorry for the slow response - running on an old VAX) |
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Deletes one or more generations of an element.
Format:
DELETE GENERATION element-expression "remark"
| 1 - Restrictions |
o You cannot delete generation 1 of an element.
o You cannot delete a generation that has variants off it.
o You cannot delete a generation that has a review pending.
o You cannot delete a generation that is reserved.
o You cannot delete a generation that is in a class.
o All generations in the specified range of generations to be
deleted must be on the same line of descent.
o You cannot use /GENERATION in combination with /AFTER, /BEFORE,
/FROM, or /TO.
o You cannot specify /AFTER and /FROM on the same command line.
o You cannot specify /BEFORE and /TO on the same command line.
| 2 - Command Parameters |
element-expression
Specifies one or more generations of an element. An element
expression can be an element name, a group name, a wildcard
expression, or a list of these separated by commas.
remark
Specifies a character string to be logged in the history file
with this command, usually used to explain why the command was
entered. The remark is enclosed in quotation marks. If no remark
was entered, a null remark ("") is logged.
| 3 - Description |
The DELETE GENERATION command removes information about one or
more generations of an element. Once a generation is deleted, it
cannot be restored to its former place in the element in the CMS
library. You can, however, archive the contents of the generation
using the /ARCHIVE qualifier and later restore the contents of the
generation.
If the generation or range of generations to be deleted has a
direct descendant generation (that is, a descendant generation on
the same line of descent), then the changes associated with those
generations are combined, and then those changes are combined
with the changes in the descendant generation. If there is
no descendant generation, that is, the generation or range of
generations to be deleted is at the end of the line of descent,
then the changes associated with those generations are discarded.
You can specify a single generation with the /GENERATION
qualifier. /GENERATION=1+ is the default. You can also specify
a range of generations with either the /AFTER or /FROM qualifier
to delimit the beginning of a range, and either the /BEFORE or /TO
qualifier to delimit the end of a range. These sets of qualifiers
can be paired to specify ranges with inclusive or exclusive
endpoints (see the restriction section).
If you delete the latest generation on the main line of descent of
an element that has the reference copy attribute, CMS deletes the
generation's reference copy and creates a new reference copy that
corresponds to the generation that is now the latest generation on
the main line of descent.
| 4 - Qualifiers |
4.1 - /AFTER[=generation-expression]
Specifies the start of a range of generations that are to be
deleted, excluding the specified generation. You cannot specify
both /AFTER and /FROM or both /AFTER and /GENERATION. You must
specify the end of the range with either the /BEFORE or /TO
qualifier.
4.2 - /ARCHIVE=[file-specification]
Specifies a file to which CMS writes archived generation
information. If the file specification is omitted, CMS creates
a file for each with the same name as the element and the .CMS_
ARCHIVE file type and places it in your default directory.
4.3 - /BEFORE[=generation-expression]
Specifies the end of a range of generations that are to be
deleted, excluding the specified generation. You cannot specify
both /BEFORE and /TO or both /BEFORE and /GENERATION. You must
specify the start of the range with either the /AFTER or /FROM
qualifier.
4.4 - /CONFIRM (D)
Controls whether CMS prompts you for confirmation before each
transaction.
When you run CMS in interactive mode, CMS prompts you for
confirmation. If you type YES, ALL, TRUE, or 1, CMS executes the
transaction. If you type NO or QUIT or press RETURN, no action
is performed. If you type any other character, CMS continues to
prompt until you type an acceptable response.
CMS does not prompt for confirmation in batch mode.
4.5 - /FROM[=generation-expression]
Specifies the start of a range of generations that are to be
deleted, including the specified generation. You cannot specify
both /FROM and /AFTER or both /FROM and /GENERATION. You must
specify the end of the range with either the /BEFORE or /TO
qualifier.
4.6 - /GENERATION[=generation-expression]
Specifies a particular generation of the element to be deleted. By
default, the most recent generation on the main line of descent is
deleted. You cannot combine /GENERATION with any of the following
qualifiers: /FROM, /TO, /AFTER, and /BEFORE.
4.7 - /LOG (D)
Controls whether CMS displays success and informational messages
on the default output device. By default, if the command executes
successfully, CMS displays a success message. If you specify
/NOLOG, success and informational messages are suppressed. Any
warning, error, or fatal error messages are displayed regardless
of whether /LOG or /NOLOG is specified.
4.8 - /OCCLUDE[=option,...]
Controls whether CMS selects the first instance of the specified
object, or all instances of the specified object in the library
search list. The options field contains one or more keywords
associated with the name of the object. The options field can
contain the following keywords:
ALL--equivalent to ELEMENT
ELEMENT (D)
NOELEMENT
NONE--equivalent to NOELEMENT
You can specify either ALL, NONE, or the [NO]ELEMENT keyword.
By default, CMS performs occlusion for all objects; that is, CMS
selects only the first occurrence of a specified object.
4.9 - /TO[=generation-expression]
Specifies the end of a range of generations that are to be
deleted, including the specified generation. You cannot specify
both /TO and /BEFORE or both /TO and /GENERATION. You must specify
the start of the range with either the /AFTER or /FROM qualifier.
| 5 - Examples |
(1) CMS> DELETE GENERATION/NOCONFIRM SAMPLE.PAS/GENERATION=5B1
_Remark: Delete variant line
%CMS-S-GENDELETED, 1 generation of element
DISKX:[PROJECT.CMSLIB]SAMPLE.PAS deleted
This command deletes generation 5B1 of the element SAMPLE.PAS.
The /NOCONFIRM qualifier directs CMS to suppress the prompt
confirming the operation.
(2) CMS> DELETE GENERATION SAMPLE.*/AFTER=V1/BEFORE=V2
_Remark: delete generations between released versions
Delete 5 generations after V1(1) before V2(7) of element SAMPLE.PAS?
[Y/N] (N): Y
%CMS-S-GENDELETED, 5 generations of element
DISKX:[PROJECT.CMSLIB]SAMPLE.PAS deleted
This command deletes all generations of the element after the
generation in class V1 and before the generation in class V2,
excluding the two generations in classes V1 and V2.
(3) CMS> DELETE GENERATION SAMPLE.PAS/AFTER=1/BEFORE=V1
_Remark: delete a range
%CMS-E-NOGENDELETED, no generations of
DISKX:[PROJECT.CMSLIB]SAMPLE.PAS deleted
-CMS-E-VARINRANGE, range has variants
CMS> DELETE GENERATION/ARCHIVE/FROM=2A1/TO=2A1+/NOCONFIRM SAMPLE.PAS
_Remark: delete the variant range and archive the deleted generations
%CMS-S-GENDELETED, 3 generations of element
DISKX:[PROJECT.CMSLIB]SAMPLE.PAS deleted
The first command specifies that all generations be deleted
between generation 1 and the generation in class V1. CMS could
not delete the generations, however, because it found variants
for the indicated generations.
The second command specifies a range of generations to be
deleted from and including the variant generation 2A1 to
and including the latest variant generation of the element
SAMPLE.PAS. In this case, CMS deleted 3 generations of the
element. The /ARCHIVE qualifier directs CMS to save the deleted
generations in an archive file in your default directory.
To display the descendants of a generation and the
classes containing the generations, use the SHOW
GENERATION/DESCENDANTS/MEMBER command.
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