Workbench Command is a set of command-line tools that can be used to perform simple and complex operations within Connectome Workbench.
MERGE CIFTI FILES ALONG DENSE DIMENSION
wb_command -cifti-merge-dense
<direction> - which dimension to merge along, ROW or COLUMN
<cifti-out> - output - the output cifti file
[-label-collision] - how to handle conflicts between label keys
<action> - 'ERROR', 'FIRST', or 'LEGACY', default 'ERROR', use
'LEGACY' to match v1.4.2 and earlier
[-cifti] - repeatable - specify an input cifti file
<cifti-in> - a cifti file to merge
The input cifti files must have matching mappings along the direction not
specified, and the mapping along the specified direction must be brain
models.