UNCHECKOUT / UNCO 
Discards the changes made to a checked-out or newly-added resource.
Syntax
Syntax | UNCHECKOUT <folderItemPath> |
Arguments | |
<folderItemPath> | The path to the item to un-checkout. |
Description | Discards the changes made to the folder item. Takes the path (local or remote) as an argument. Wild characters are accepted |
Example
To discard the changes made on the a.java file, execute:
unco a.java