- Perform a merge, not just a read.
+ Perform a merge, not just a read. The command will
+ refuse to run if your index file has unmerged entries,
+ indicating that you have not finished previous merge you
- Same as -m except that unmerged entries will be silently ignored.
+ Same as -m, except that unmerged entries are discarded
After a successful merge, update the files in the work
trees that are not directly related to the current
working tree status into a temporary index file.
The id of the tree object(s) to be read/merged.