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Creates a new branch in the version tree of an element


ProductCommand type
ClearCasecleartool subcommand
ClearCase LTcleartool subcommand



mkbranch [ –c·omment comment | –cfi·le comment-file-pname |–cq·uery
| –cqe·ach | –nc·omment ] [ –nwa·rn ]
[ –nco ] [ –ver·sion version-selector ] branch-type-selector pname ...


The mkbranch command creates a new branch in the version trees of one or more elements. The new branch is checked out, unless you use the –nco option.


The checkout command sometimes invokes mkbranch automatically. If the view's version of an element is selected by a config spec rule with a –mkbranch branch-type clause, checkout does the following:

  1. Creates a branch of type branch-type.
  2. Checks out (version 0 on) the newly created branch.

Similarly, entering a mkbranch command explicitly can invoke one or more additional branch-creation operations (see the checkout reference page).



You must have one of the following identities:

  • Element group member
  • Element 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)


An error occurs if one or more of these objects are locked: VOB, element type, branch type, element, pool (nondirectory elements).


(Replicated VOBs) Your current replica must master the branch type.


Event Records and Comments

Creates one or more event records, with commenting controlled by your .clearcase_profile file (default: –cqe). See the comments reference page. Comments can be edited with chevent.

–c·omment comment | –cfi·le comment-file-pname |–cq·uery | –cqe·ach | –nc·omment
Overrides the default with the option you specify. See the comments reference page.

Suppressing Warning Messages

Warning messages are displayed.

Suppresses warning messages.

Checkout of the New Branch

The newly created branch is checked out. Additional checkouts may ensue; see the “Auto-Make-Branch” section.

Suppresses automatic checkout of the branch.

Specifying the Branch Type


An existing branch type, previously created with mkbrtype. The branch type must exist in each VOB in which you are creating a branch, or (if branch-type-selector is a global type) in the administrative VOB hierarchy associated with each VOB. Specify branch-type-selector in the form [brtype:]type-name[@vob-selector]
type-name Name of the branch type
vob-selector VOB specifier
 pname-in-vob 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)

Specifying the Branch Points


–ver·sion version-selector
For each pname, creates the branch at the version specified by version-selector. This option overrides both version-selection by the view and version-extended naming. See the version_selector reference page for syntax details.

pname ...
One or more pathnames, indicating the versions at which branches are to be created.
  • A standard or view-extended pathname to an element specifies the version in the view.

  • A version-extended pathname specifies a version, independent of view.

Use –version to override these interpretations of pname.


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.

  • On a UNIX system, create a branch type named bugfix. Then, set a view with a config spec that prefers versions on the bugfix branch, and create a branch of that type in file util.h.

    cmd-context mkbrtype –c "bugfixing branch" bugfix 
    Created branch type "bugfix".
    cmd-context setview smg_bugfix 
    cmd-context mkbranch –nc bugfix util.h 
    Created branch "bugfix" from "util.h" version "/main/1".
    Checked out "util.h" from version "/main/bugfix/0".

  • On a Windows system, create a branch type named bugfix. Then, set a view drive with a config spec that prefers versions on the bugfix branch, and create a branch of that type in file util.h.

    cmd-context mkbrtype –c "bugfixing branch" bugfix 
    Created branch type "bugfix".
    > net use y: \\view\smg_bugfix 
    > y: 
    cmd-context mkbranch –nc bugfix util.h 
    Created branch "bugfix" from "util.h" version "\main\1".
    Checked out "util.h" from version "\main\bugfix\0".

  • Create a branch named rel2_bugfix off the version of hello.c in the view, and check out the initial version on the branch.

    cmd-context mkbranch –nc rel2_bugfix hello.c 
    Created branch "rel2_bugfix" from "hello.c" version "/main/4".
    Checked out "hello.c" from version "/main/rel2_bugfix/0". 

  • Create a branch named maintenance off version \main\1 of file util.c. Do not check out the initial version on the branch.

    cmd-context mkbranch –version \main\1 –nco –nc maintenance util.c 
    Created branch "maintenance" from "util.c" version "\main\1".

  • Create a branch named bugfix off version /main/3 of file hello.c, and check out the initial version on the branch. Use a version-extended pathname to specify the version.

    cmd-context mkbranch –nc bugfix hello.c@@/main/3 
    Created branch "bugfix" from "hello.c" version "/main/3".
    Checked out "hello.c" from version "/main/bugfix/0".

  • For each file with a .c extension, create a branch named patch2 at the currently selected version, but do not check out the initial version on the new branch. Provide a comment on the command line.

    cmd-context mkbranch –nco –c "release 2 code patches" patch2 *.c 
    Created branch "patch2" from "cm_add.c" version "\main\1".
    Created branch "patch2" from "cm_fill.c" version "\main\3".
    Created branch "patch2" from "msg.c" version "\main\2".
    Created branch "patch2" from "util.c" version "\main\1".


mkbrtype, rename



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