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UC help wrote:For Read Only Merge Mode the following syntax must be used:
uc -rom <path1> <path2> <path3>
<path1> and <path2> specify the files that are to be compared, but the intent is not to modify the original files at all during the compare/merge process. The file specified in <path1> will be copied to <path3> for comparison/merge. The file specified with <path3> will be displayed in the left pane and the file specified with <path2> will be displayed in the right pane. Please note: It will only be possible to merge into the document specified with <path3>. The file this is being compared to will be locked as Read Only.