IPnom Home • Manuals • ClearCase

 Rational ClearCase Commands Reference

ClearCase Stuff:ClearCase LinksClearCase BooksClearCase Commands ReferenceClearCase ForumsClearCase News
Keyword Live Search (10 results max):
 Type in part of a ClearCase command in the search box.
Commands Index:


Changes the comment string in an event record


ProductCommand type
ClearCasecleartool subcommand
ClearCase LTcleartool subcommand



chevent [ –c·omment comment | –cfi·le comment-file-pname
| –cq·uery | –cqe·ach | –nc·omment ]
[ –app·end | –ins·ert | –rep·lace ]
{ –eve·nt [ –inv·ob vob-selector ] event-ID ...
| [ –pna·me ] pname ...
| object-selector ...


The chevent command modifies or replaces the comment string in one or more existing event records. It is useful for correcting typing errors and for including information that was omitted in the original comment.

There are several ways to specify an event record whose comment you want to change:

  • If you specify a checked-out version, chevent changes the comment in the checkout event record.
  • If you specify any other object, chevent changes that object's creation event record. For example, if you specify a label type object, chevent changes the comment supplied when that label type was created with mklbtype.
  • You can change the comment in an arbitrary event record by passing its event ID to the –event option. Use the command lshistory –eventid to capture event IDs. (Event IDs remain valid until the VOB is reformatted with reformatvob.)

For details about the operations that cause event records to be created and how event records are attached to objects, see the events_ccase reference page. See also the comments reference page.



You must have one of the following identities:

  • User associated with the event
  • Object owner
  • VOB owner
  • root (UNIX)
  • Member of the ClearCase administrators group (ClearCase on Windows)
  • Local administrator of the ClearCase LT server host (ClearCase LT on Windows)


The following restrictions apply:

ObjectLocks that prevent changing the object's events
PoolVOB, pool
ElementVOB, element type
TypeVOB, type
Branch, versionVOB, element type, element, branch type, branch
HyperlinkVOB, hyperlink type


(Replicated VOBs only) For a version, your current replica must master the branch containing the version. For any other object, your current replica must master the object.


Specifying the Comment Change

For each object or event, chevent prompts for a comment string to apply to the corresponding event record.

–c·omment comment
Specifies a character string to replace the existing comment or be added to it.

–cfi·le comment-file-pname
Specifies a text file whose contents are to be placed in the event record.

Note: A final newline character in this file is included in the comment.

Prompts for one comment, which will be used to update all of the event records.

Same as default—prompts for a separate comment string for each object or event ID.

No comment. When combined with –replace, this option removes the existing comment. Otherwise, it nullifies the effect of chevent.

Specifying How to Change the Comment

The new comment is appended to the existing one. On UNIX systems, it is preceded by a newline character.

Same as default.

The new comment is inserted before the existing one. On UNIX systems, the new comment is followed by a newline character.

The existing comment is discarded; the new comment replaces it.

Specifying Event Records to Be Changed

You can indicate which event record is to be changed by specifying a file system object, a non-file-system object, or a numerical event ID.


–eve·nt [ –inv·ob vob-selector ] event-ID ...
Specifies one or more events by their numeric event IDs. The –event keyword can appear anywhere an option is valid; the event ID arguments must appear at the end of the command (that is, after all options). By default, event IDs specify events in the VOB containing the current working directory; use –invob vob-selector to specify another VOB.

To determine the event ID of an event, use lshistory –eventid.

[ –pna·me ] pname ...
A standard pathname or VOB-extended pathname, indicating the creation event record for an element, branch, or version object. The standard pathname of an element specifies the version in your view. The –pname option is required only if the pathname looks like an object-selector (for example, an element named pool:one).

Specifying a checked-out version changes its checkout version comment. You can use any of the following to specify the checked-out version:

hello.hStandard pathname
hello.h@@\main\rel2_bugfix\CHECKEDOUTExtended pathname to checked-out “placeholder” version
hello.h@@/main/rel2_bugfix/CHECKEDOUT.465Placeholder version has unique numeric suffix
object-selector ...
One or more object-selectors, in any of these forms:
vob-selector vob:pname-in-vob
  pname-in-vob can be the pathname of the VOB tag (whether or not the VOB is mounted) or of any file system object within the VOB (if the VOB is mounted). It cannot be the pathname of the VOB storage directory.
attribute-type-selector attype:type-name[@vob-selector]
branch-type-selector brtype:type-name[@vob-selector]
element-type-selector eltype:type-name[@vob-selector]
hyperlink-type-selector hltype:type-name[@vob-selector]
label-type-selector lbtype:type-name[@vob-selector]
trigger-type-selector trtype:type-name[@vob-selector]
pool-selector pool:pool-name[@vob-selector]
hlink-selector hlink:hlink-id[@vob-selector]
oid-obj-selector oid:object-oid[@vob-selector]
The following object selector is valid only if you use MultiSite:
replica-selector replica:replica-name[@vob-selector]


The UNIX examples in this section are written for use in csh. If you use another shell, you may need to use different quoting and escaping conventions.

The Windows examples that include wildcards or quoting are written for use in cleartool interactive mode. If you use cleartool single-command mode, you may need to change the wildcards and quoting to make your command interpreter process the command appropriately.

In cleartool single-command mode, cmd-context represents the UNIX shell or Windows command interpreter prompt, followed by the cleartool command. In cleartool interactive mode, cmd-context represents the interactive cleartool prompt.

  • Add a creation comment for an element, verifying the change with describe.

    cmd-context  chevent hello.c@@ 
    Comments for "hello.c":
    Main module of greeting program.
    Modified event of file element "hello.c". 
    cmd-context  describe hello.c@@ 
    file element "hello.c@@"
    created 04-Dec-98.14:38:26 by anne.user
      "Main module of greeting program"
      element type: text_file
    source pool: p1 cleartext pool: pc1

  • Add a header to a checked-out version's checkout comment.

    cmd-context  lscheckout bye.c 
    13-May.13:58 anne checkout version "bye.c" from /main/1 (reserved)
    "Improve error handling."

    cmd-context  chevent –insert –c "Fix bug #2493:" bye.c 
    Modified event of version "bye.c".
    cmd-context  lscheckout bye.c 
    13-May.13:58 anne checkout version "bye.c" from /main/11 (reserved)
    "Fix bug #2493:
     Improve error handling."

  • Update a branch type creation comment.

    cmd-context  chevent –append brtype:v1_bugfix 
    Comments for "v1_bugfix":
    Branches should sprout from the version labeled 'V1' 
    Modified event of branch type "v1_bugfix"
    cmd-context   lstype brtype:v1_bugfix 
    28-Mar.16:26 ali branch type "v1_bugfix"
     "Branch for fixes to version 1.
     Branches should sprout from the version labeled 'V1'"

  • Delete the comment on a branch object.

    cmd-context   chevent –replace –nc welcome.c@@/main/v1_bugfix
    Modified event of branch "welcome.c".

  • Find the event ID for an operation and append a comment string to the one already assigned to that event. Then verify that the new comment was added.

    cmd-context  lshistory –long –eventid util.c 
    event 45678:
    21-Mar-99.14:45:20 Anne Duvo (anne@neptune)
    destroy sub-branch "bugfix" of branch "util.c@@\main"
    “Destroyed branch “\main\bugfix"."
    cmd-context  chevent –c "bugfix merge completed." –append –event 45678 
    Modified event "45678".
      lshistory –long –eventid util.c 
    event 45678:
    21-Mar-99.14:45:20 Anne Duvo (anne@neptune)
    destroy sub-branch "bugfix" of branch "util.c@@\main"
     "Destroyed branch "\main\bugfix".
    "bugfix merge completed."



ClearCase Links • ClearCase Books • ClearCase Commands Reference • ClearCase Forums • ClearCase News