ClearCase Support: How to Merge
If you ever need to merge a text file or directory from the command line or from an automated script, then this is the command that you will need. Basically, this command will merge two versions together on a single element.
|cleartool merge -to "ELEMENT_PATH" FROM_VERSION|
This command will merge to the version that your View's config spec is set to access.
by Phil for Humanity